1
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Colfer L, Bagués N, Noor-A-Alam M, Schmidt M, Nolan M, McComb DW, Keeney L. Tilting and Distortion in the Multiferroic Aurivillius Phase Bi 6Ti 3Fe 1.5Mn 0.5O 18. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2024; 36:5474-5486. [PMID: 38883432 PMCID: PMC11170937 DOI: 10.1021/acs.chemmater.4c00413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/14/2024] [Revised: 05/20/2024] [Accepted: 05/23/2024] [Indexed: 06/18/2024]
Abstract
Aurivillius structured Bi6Ti3Fe1.5Mn0.5O18 (B6TFMO) has emerged as a rare room temperature multiferroic, exhibiting reversible magnetoelectric switching of ferroelectric domains under cycled magnetic fields. This layered oxide presents exceptional avenues for advancing data storage technologies owing to its distinctive ferroelectric and ferrimagnetic characteristics. Despite its immense potential, a comprehensive understanding of the underlying mechanisms driving multiferroic behavior remains elusive. Herein, we employ atomic resolution electron microscopy to elucidate the interplay of octahedral tilting and atomic-level structural distortions within B6TFMO, associating these phenomena with functional properties. Fundamental electronic features at varying bonding environments within this complex system are scrutinized using electron energy loss spectroscopy (EELS), revealing that the electronic nature of the Ti4+ cations within perovskite BO6 octahedra is influenced by position within the Aurivillius structure. Layer-by-layer EELS analysis shows an ascending crystal field splitting (Δ) trend from outer to center perovskite layers, with an average increase in Δ of 0.13 ± 0.06 eV. Density functional theory calculations, supported by atomic resolution polarization vector mapping of B-site cations, underscore the correlation between the evolving nature of Ti4+ cations, the extent of tetragonal distortion and ferroelectric behavior. Integrated differential phase contrast imaging unveils the position of light oxygen atoms in B6TFMO for the first time, exposing an escalating degree of octahedral tilting toward the center layers, which competes with the magnitude of BO6 tetragonal distortion. The observed octahedral tilting, influenced by B-site cation arrangement, is deemed crucial for juxtaposing magnetic cations and establishing long-range ferrimagnetic order in multiferroic B6TFMO.
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Affiliation(s)
- Louise Colfer
- Tyndall National Institute, University College Cork, Lee Maltings Complex, Dyke Parade, Cork T12 R5CP, Ireland
| | - Núria Bagués
- Center for Electron Microscopy and Analysis, The Ohio State University, Columbus, Ohio 43212, United States
- Department of Materials Sciences and Engineering, The Ohio State University, Columbus, Ohio 43210, United States
| | - Mohammad Noor-A-Alam
- Tyndall National Institute, University College Cork, Lee Maltings Complex, Dyke Parade, Cork T12 R5CP, Ireland
| | - Michael Schmidt
- Tyndall National Institute, University College Cork, Lee Maltings Complex, Dyke Parade, Cork T12 R5CP, Ireland
| | - Michael Nolan
- Tyndall National Institute, University College Cork, Lee Maltings Complex, Dyke Parade, Cork T12 R5CP, Ireland
| | - David W McComb
- Center for Electron Microscopy and Analysis, The Ohio State University, Columbus, Ohio 43212, United States
- Department of Materials Sciences and Engineering, The Ohio State University, Columbus, Ohio 43210, United States
| | - Lynette Keeney
- Tyndall National Institute, University College Cork, Lee Maltings Complex, Dyke Parade, Cork T12 R5CP, Ireland
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2
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Li N, Lee HJ, Sri Gyan D, Ahn Y, Landahl EC, Carnis J, Lee JY, Kim TY, Unithrattil S, Jo JY, Chun SH, Kim S, Park SY, Eom I, Adamo C, Li SJ, Kaaret JZ, Schlom DG, Wen H, Benedek NA, Evans PG. Ultrafast Optically Induced Perturbation of Oxygen Octahedral Rotations in Multiferroic BiFeO 3 Thin Films. NANO LETTERS 2024; 24:6417-6424. [PMID: 38710072 DOI: 10.1021/acs.nanolett.4c01519] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2024]
Abstract
The functional properties of complex oxides, including magnetism and ferroelectricity, are closely linked to subtle structural distortions. Ultrafast optical excitations provide the means to manipulate structural features and ultimately to affect the functional properties of complex oxides with picosecond-scale precision. We report that the lattice expansion of multiferroic BiFeO3 following above-bandgap optical excitation leads to distortion of the oxygen octahedral rotation (OOR) pattern. The continuous coupling between OOR and strain was probed using time-resolved X-ray free-electron laser diffraction with femtosecond time resolution. Density functional theory calculations predict a relationship between the OOR and the elastic strain consistent with the experiment, demonstrating a route to employing this approach in a wider range of systems. Ultrafast control of the functional properties of BiFeO3 thin films is enabled by this approach because the OOR phenomena are related to ferroelectricity, and via the Fe-O-Fe bond angles, the superexchange interaction between Fe atoms.
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Affiliation(s)
- Ni Li
- Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Hyeon Jun Lee
- Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
- Department of Materials Science and Engineering, Kangwon National University, Samcheok 25913, South Korea
| | - Deepankar Sri Gyan
- Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Youngjun Ahn
- Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Eric C Landahl
- Department of Physics and Astrophysics, DePaul University, Chicago, Illinois 60614, United States
| | - Jerome Carnis
- Aix Marseille Université, Université de Toulon, CNRS, IM2NP, Marseille 13013, France
- ESRF - The European Synchrotron, 71 Avenue des Martyrs, Grenoble 38000, France
| | - Jun Young Lee
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, South Korea
| | - Tae Yeon Kim
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, South Korea
| | - Sanjith Unithrattil
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, South Korea
| | - Ji Young Jo
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, South Korea
| | - Sae Hwan Chun
- Pohang Accelerator Laboratory, POSTECH, Pohang, Gyeongbuk 37673, South Korea
| | - Sunam Kim
- Pohang Accelerator Laboratory, POSTECH, Pohang, Gyeongbuk 37673, South Korea
| | - Sang-Youn Park
- Pohang Accelerator Laboratory, POSTECH, Pohang, Gyeongbuk 37673, South Korea
| | - Intae Eom
- Pohang Accelerator Laboratory, POSTECH, Pohang, Gyeongbuk 37673, South Korea
| | - Carolina Adamo
- Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, United States
| | - Sabrina J Li
- Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, United States
| | - Jeffrey Z Kaaret
- School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, United States
| | - Darrell G Schlom
- Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, United States
- Kavli Institute at Cornell for Nanoscale Science, Ithaca, New York 14853, United States
- Leibniz-Institut für Kristallzüchtung, Max-Born-Straße 2, 12489 Berlin, Germany
| | - Haidan Wen
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Nicole A Benedek
- Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, United States
| | - Paul G Evans
- Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
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3
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Liu Q, Cui S, Bian R, Pan E, Cao G, Li W, Liu F. The Integration of Two-Dimensional Materials and Ferroelectrics for Device Applications. ACS NANO 2024; 18:1778-1819. [PMID: 38179983 DOI: 10.1021/acsnano.3c05711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2024]
Abstract
In recent years, there has been growing interest in functional devices based on two-dimensional (2D) materials, which possess exotic physical properties. With an ultrathin thickness, the optoelectrical and electrical properties of 2D materials can be effectively tuned by an external field, which has stimulated considerable scientific activities. Ferroelectric fields with a nonvolatile and electrically switchable feature have exhibited enormous potential in controlling the electronic and optoelectronic properties of 2D materials, leading to an extremely fertile area of research. Here, we review the 2D materials and relevant devices integrated with ferroelectricity. This review starts to introduce the background about the concerned themes, namely 2D materials and ferroelectrics, and then presents the fundamental mechanisms, tuning strategies, as well as recent progress of the ferroelectric effect on the optical and electrical properties of 2D materials. Subsequently, the latest developments of 2D material-based electronic and optoelectronic devices integrated with ferroelectricity are summarized. Finally, the future outlook and challenges of this exciting field are suggested.
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Affiliation(s)
- Qing Liu
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313099, China
- School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
| | - Silin Cui
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313099, China
- School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
| | - Renji Bian
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313099, China
- School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
| | - Er Pan
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313099, China
- School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
| | - Guiming Cao
- School of Information Science and Technology, Xi Chang University, 615013 Xi'an, China
| | - Wenwu Li
- Shanghai Frontiers Science Research Base of Intelligent Optoelectronics and Perception, Institute of Optoelectronics, Department of Materials Science, Fudan University, Shanghai 200433, China
| | - Fucai Liu
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313099, China
- School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
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4
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Lu XZ, Zhang HM, Zhou Y, Zhu T, Xiang H, Dong S, Kageyama H, Rondinelli JM. Out-of-plane ferroelectricity and robust magnetoelectricity in quasi-two-dimensional materials. SCIENCE ADVANCES 2023; 9:eadi0138. [PMID: 37992171 PMCID: PMC10665001 DOI: 10.1126/sciadv.adi0138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Accepted: 10/23/2023] [Indexed: 11/24/2023]
Abstract
Thin-film ferroelectrics have been pursued for capacitive and nonvolatile memory devices. They rely on polarizations that are oriented in an out-of-plane direction to facilitate integration and addressability with complementary metal-oxide semiconductor architectures. The internal depolarization field, however, formed by surface charges can suppress the out-of-plane polarization in ultrathin ferroelectric films that could otherwise exhibit lower coercive fields and operate with lower power. Here, we unveil stabilization of a polar longitudinal optical (LO) mode in the n = 2 Ruddlesden-Popper family that produces out-of-plane ferroelectricity, persists under open-circuit boundary conditions, and is distinct from hyperferroelectricity. Our first-principles calculations show the stabilization of the LO mode is ubiquitous in chalcogenides and halides and relies on anharmonic trilinear mode coupling. We further show that the out-of-plane ferroelectricity can be predicted with a crystallographic tolerance factor, and we use these insights to design a room-temperature multiferroic with strong magnetoelectric coupling suitable for magneto-electric spin-orbit transistors.
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Affiliation(s)
- Xue-Zeng Lu
- Key Laboratory of Quantum Materials and Devices of Ministry of Education, School of Physics, Southeast University, Nanjing 211189, People's Republic of China
| | - Hui-Min Zhang
- Key Laboratory of Quantum Materials and Devices of Ministry of Education, School of Physics, Southeast University, Nanjing 211189, People's Republic of China
| | - Ying Zhou
- Key Laboratory of Quantum Materials and Devices of Ministry of Education, School of Physics, Southeast University, Nanjing 211189, People's Republic of China
| | - Tong Zhu
- Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Hongjun Xiang
- Key Laboratory of Computational Physical Sciences (Ministry of Education), Institute of Computational Physical Sciences, and Department of Physics, Fudan University, Shanghai 200433, People's Republic of China
- Shanghai Qi Zhi Institute, Shanghai 200030, People's Republic of China
| | - Shuai Dong
- Key Laboratory of Quantum Materials and Devices of Ministry of Education, School of Physics, Southeast University, Nanjing 211189, People's Republic of China
| | - Hiroshi Kageyama
- Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - James M Rondinelli
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, USA
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5
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Cattermull J, Roth N, Cassidy SJ, Pasta M, Goodwin AL. K-Ion Slides in Prussian Blue Analogues. J Am Chem Soc 2023; 145:24249-24259. [PMID: 37879069 PMCID: PMC10636749 DOI: 10.1021/jacs.3c08751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Revised: 09/19/2023] [Accepted: 09/26/2023] [Indexed: 10/27/2023]
Abstract
We study the phenomenology of cooperative off-centering of K+ ions in potassiated Prussian blue analogues (PBAs). The principal distortion mechanism by which this off-centering occurs is termed a "K-ion slide", and its origin is shown to lie in the interaction between local electrostatic dipoles that couple through a combination of electrostatics and elastic strain. Using synchrotron powder X-ray diffraction measurements, we determine the crystal structures of a range of low-vacancy K2M[Fe(CN)6] PBAs (M = Ni, Co, Fe, Mn, Cd) and establish an empirical link between composition, temperature, and slide-distortion magnitude. Our results reflect the common underlying physics responsible for K-ion slides and their evolution with temperature and composition. Monte Carlo simulations driven by a simple model of dipolar interactions and strain coupling reproduce the general features of the experimental phase behavior. We discuss the implications of our study for optimizing the performance of PBA K-ion battery cathode materials and also its relevance to distortions in other, conceptually related, hybrid perovskites.
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Affiliation(s)
- John Cattermull
- Inorganic
Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR, U.K.
- Department
of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, U.K.
| | - Nikolaj Roth
- Inorganic
Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR, U.K.
- iNANO, Aarhus, DK-8000 Denmark
| | - Simon J. Cassidy
- Inorganic
Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR, U.K.
| | - Mauro Pasta
- Department
of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, U.K.
| | - Andrew L. Goodwin
- Inorganic
Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR, U.K.
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6
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Cattermull J, Pasta M, Goodwin AL. Predicting Distortion Magnitudes in Prussian Blue Analogues. J Am Chem Soc 2023; 145. [PMID: 37931061 PMCID: PMC10655185 DOI: 10.1021/jacs.3c08752] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Revised: 10/27/2023] [Accepted: 10/30/2023] [Indexed: 11/08/2023]
Abstract
Based on simple electrostatic and harmonic potential considerations, we derive a straightforward expression linking the composition of a Prussian blue analogue (PBA) to its propensity to undergo collective structural distortions. We demonstrate the existence of a threshold value, below which PBAs are undistorted and above which PBAs distort by a degree that is controlled by a geometric tolerance factor. Our analysis rationalizes the presence, absence, and magnitude of distortions in a wide range of PBAs and distinguishes their structural chemistry from that of other hybrid perovskites.
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Affiliation(s)
- John Cattermull
- Inorganic
Chemistry Laboratory, Department of Chemistry, University of Oxford, Oxford OX1 3QR, U.K.
- Department
of Materials, University of Oxford, Oxford OX1 3PH, U.K.
| | - Mauro Pasta
- Department
of Materials, University of Oxford, Oxford OX1 3PH, U.K.
| | - Andrew L. Goodwin
- Inorganic
Chemistry Laboratory, Department of Chemistry, University of Oxford, Oxford OX1 3QR, U.K.
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7
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Yananose K, Clark ER, Saines PJ, Barone P, Stroppa A, Yu J. Synthesis and Magnetic Properties of the Multiferroic [C(NH 2) 3]Cr(HCOO) 3 Metal-Organic Framework: The Role of Spin-Orbit Coupling and Jahn-Teller Distortions. Inorg Chem 2023; 62:17299-17309. [PMID: 37819728 PMCID: PMC10598855 DOI: 10.1021/acs.inorgchem.3c02557] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Indexed: 10/13/2023]
Abstract
We report for the first time the synthesis of [C(NH2)3]Cr(HCOO)3 stabilizing Cr2+ in formate perovskite, which adopts a polar structure and orders magnetically below 8 K. We discuss in detail the magnetic properties and their coupling to the crystal structure based on first-principles calculations, symmetry, and model Hamiltonian analysis. We establish a general model for the orbital magnetic moment of [C(NH2)3]M(HCOO)3 (M = Cr, Cu) based on perturbation theory, revealing the key role of the Jahn-Teller distortions. We also analyze their spin and orbital textures in k-space, which show unique characteristics.
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Affiliation(s)
- Kunihiro Yananose
- Korea
Institute for Advanced Study, Seoul 02455, Republic of Korea
- Center
for Theoretical Physics, Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea
| | - Ewan R. Clark
- School
of Chemistry and Forensic Science, University
of Kent, Canterbury CT2 7NH, U.K.
| | - Paul J. Saines
- School
of Chemistry and Forensic Science, University
of Kent, Canterbury CT2 7NH, U.K.
| | - Paolo Barone
- Consiglio
Nazionale delle Ricerche, Institute for Superconducting and Innovative
Materials and Devices (CNR-SPIN), Area della Ricerca di Tor Vergata, Via del Fosso del Cavaliere 100, 00133 Rome, Italy
| | - Alessandro Stroppa
- Consiglio
Nazionale delle Ricerche, Institute for Superconducting and Innovative
Materials and Devices (CNR-SPIN) c/o Department of Physical and Chemical
Sciences, University of L’Aquila, Via Vetoio, I-67100 Coppito, L’Aquila, Italy
| | - Jaejun Yu
- Center
for Theoretical Physics, Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea
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8
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Barbosa MC, da Silva EL, Lekshmi PN, Marcondes ML, Assali LVC, Petrilli HM, Lopes AML, Araújo JP. Pressure-Induced Phase Transformations of Quasi-2D Sr 3Hf 2O 7. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2023; 127:15435-15442. [PMID: 37706058 PMCID: PMC10497066 DOI: 10.1021/acs.jpcc.3c01596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Revised: 06/07/2023] [Indexed: 09/15/2023]
Abstract
We present an abinitio study of the quasi-2D layered perovskite Sr3Hf2O7 compound, performed within the framework of the density functional theory and lattice dynamics analysis. At high temperatures, this compound takes a I4/mmm centrosymmetric structure (S.G. n. 139); as the temperature is lowered, the symmetry is broken into other intermediate polymorphs before reaching the ground-state structure, which is the Cmc21 ferroelectric phase (S.G. n. 36). One of these intermediate polymorphs is the Ccce structural phase (S.G. n. 68). Additionally, we have probed the C2/c system (S.G n. 15), which was obtained by following the atomic displacements corresponding to the eigenvectors of the imaginary frequency mode localized at the Γ-point of the Ccce phase. By observing the enthalpies at low pressures, we found that the Cmc21 phase is thermodynamically the most stable. Our results show that the I4/mmm and C2/c phases never stabilize in the 0-20 GPa range of pressure values. On the other hand, the Ccce phase becomes energetically more stable at around 17 GPa, surpassing the Cmc21 structure. By considering the effect of entropy and the constant-volume free energies, we observe that the Cmc21 polymorph is energetically the most stable phase at low temperature; however, at 350 K, the Ccce system becomes the most stable. By probing the volume-dependent free energies at 19 GPa, we see that Ccce is always the most stable phase between the two structures and also throughout the studied temperature range. When analyzing the phonon dispersion frequencies, we conclude that the Ccce system becomes dynamically stable only around 19-20 GPa and that the Cmc21 phase is metastable up to 30 GPa.
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Affiliation(s)
- M. C.
B. Barbosa
- IFIMUP,
Institute of Physics for Advanced Materials, Nanotechnology and Photonics,
Department of Physics and Astronomy, Faculty of Sciences, University of Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal
| | - E. Lora da Silva
- IFIMUP,
Institute of Physics for Advanced Materials, Nanotechnology and Photonics,
Department of Physics and Astronomy, Faculty of Sciences, University of Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal
- High
Performance Computing Chair, University
of Évora, Largo
dos Colegiais 2, 7004-516 Évora, Portugal
| | - P. Neenu Lekshmi
- IFIMUP,
Institute of Physics for Advanced Materials, Nanotechnology and Photonics,
Department of Physics and Astronomy, Faculty of Sciences, University of Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal
| | - M. L. Marcondes
- Instituto
de Física, Universidade de São
Paulo, Rua do Matao 1371, 05508-090 São Paulo, SP, Brazil
| | - L. V. C. Assali
- Instituto
de Física, Universidade de São
Paulo, Rua do Matao 1371, 05508-090 São Paulo, SP, Brazil
| | - H. M. Petrilli
- Instituto
de Física, Universidade de São
Paulo, Rua do Matao 1371, 05508-090 São Paulo, SP, Brazil
| | - A. M. L. Lopes
- IFIMUP,
Institute of Physics for Advanced Materials, Nanotechnology and Photonics,
Department of Physics and Astronomy, Faculty of Sciences, University of Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal
| | - J. P. Araújo
- IFIMUP,
Institute of Physics for Advanced Materials, Nanotechnology and Photonics,
Department of Physics and Astronomy, Faculty of Sciences, University of Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal
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9
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Kwon YJ, Yeo Y, Kim MS, Kim YJ, Park HS, Kim J, Choi SY, Yang CH. Observation of Hidden Polar Phases and Flux Closure Domain Topology in Bi 2WO 6 Thin Films. NANO LETTERS 2023; 23:4557-4563. [PMID: 37154863 DOI: 10.1021/acs.nanolett.3c01009] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Topological textures of ferroelectric polarizations have promise as alternative devices for future information technology. A polarization rotation inevitably deviates from the stable orientation in axial ferroelectrics, but local energy losses compromise the global symmetry, resulting in a distorted shape of the topological vortex or inhibiting the vortex. Easy planar isotropy helps to promote rotating structures and, accordingly, to facilitate access to nontrivial textures. Here, we investigate the domain structure of an epitaxial thin film of bismuth tungsten oxide (Bi2WO6) grown on a (001) SrTiO3 substrate. By using angle-resolved piezoresponse force microscopy and scanning transmission electron microscopy, we find the existence of a hidden phase with ⟨100⟩-oriented ferroelectric polarizations in the middle of the four variant ⟨110⟩-oriented polarization domains, which assists in the formation of flux closure domains. The results suggest that this material is one step closer to becoming an isotropic two-dimensional polar material.
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Affiliation(s)
- Yong-Jun Kwon
- Department of Physics, Korea Advanced Institute of Science and Technology, Yuseong-gu, Daejeon 34141, Republic of Korea
- Center for Lattice Defectronics, Korea Advanced Institute of Science and Technology, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Youngki Yeo
- Department of Physics, Korea Advanced Institute of Science and Technology, Yuseong-gu, Daejeon 34141, Republic of Korea
- Center for Lattice Defectronics, Korea Advanced Institute of Science and Technology, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Min-Su Kim
- Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang 37673, Republic of Korea
| | - Yong-Jin Kim
- Department of Physics, Korea Advanced Institute of Science and Technology, Yuseong-gu, Daejeon 34141, Republic of Korea
- Center for Lattice Defectronics, Korea Advanced Institute of Science and Technology, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Heung-Sik Park
- Department of Physics, Korea Advanced Institute of Science and Technology, Yuseong-gu, Daejeon 34141, Republic of Korea
- Center for Lattice Defectronics, Korea Advanced Institute of Science and Technology, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Jaegyu Kim
- Department of Physics, Korea Advanced Institute of Science and Technology, Yuseong-gu, Daejeon 34141, Republic of Korea
- Center for Lattice Defectronics, Korea Advanced Institute of Science and Technology, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Si-Young Choi
- Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang 37673, Republic of Korea
- Department of Semiconductor Engineering, Pohang University of Science and Technology, Pohang 37673, Republic of Korea
- Center of van der Waals Quantum Solids, Institute for Basic Science, Pohang 37673, Republic of Korea
| | - Chan-Ho Yang
- Department of Physics, Korea Advanced Institute of Science and Technology, Yuseong-gu, Daejeon 34141, Republic of Korea
- Center for Lattice Defectronics, Korea Advanced Institute of Science and Technology, Yuseong-gu, Daejeon 34141, Republic of Korea
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10
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Cheng L, Yu X, Huang D, Wang H, Wu Y. Piezocatalytic performance of Fe2O3−Bi2MoO6 catalyst for dye degradation. Front Chem Sci Eng 2023. [DOI: 10.1007/s11705-022-2265-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/16/2023]
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11
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Tarasova N. Layered Perovskites BaLn nIn nO 3n+1 ( n = 1, 2) for Electrochemical Applications: A Mini Review. MEMBRANES 2022; 13:34. [PMID: 36676841 PMCID: PMC9865682 DOI: 10.3390/membranes13010034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Revised: 12/22/2022] [Accepted: 12/23/2022] [Indexed: 06/17/2023]
Abstract
Modern humanity is facing many challenges, such as declining reserves of fossil energy resources and their increasing prices, climate change and an increase in the number of respiratory diseases including COVID-19. This causes an urgent need to create advanced energy materials and technologies to support the sustainable development of renewable energy systems including hydrogen energy. Layered perovskites have many attractions due to their physical and chemical properties. The structure of such compounds contains perovskite layers divided by layers with different frameworks, which provide their properties' features. Proton-conduction layered perovskites open up a novel structural class of protonic conductors, potentially suitable for application in such hydrogen energy devices as protonic ceramic electrolysis cells and protonic ceramic fuel cells. In this mini review, the special features of proton transport in the novel class of proton conductors BaLnnInnO3n+1 (n = 1, 2) with a layered perovskite structure are observed and general regularities are discussed.
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Affiliation(s)
- Nataliia Tarasova
- The Institute of High Temperature Electrochemistry of the Ural Branch of the Russian Academy of Sciences, 620066 Yekaterinburg, Russia;
- Institute of Hydrogen Energy, Ural Federal University, 620075 Yekaterinburg, Russia
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12
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Oxygen Ion and Proton Transport in Alkali-Earth Doped Layered Perovskites Based on BaLa2In2O7. INORGANICS 2022. [DOI: 10.3390/inorganics10100161] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Inorganic materials with layered perovskite structures have a wide range of physical and chemical properties. Layered perovskites based on BaLanInnO3n+1 (n = 1, 2) were recently investigated as protonic conductors. This work focused on the oxygen ion and proton transport (ionic conductivity and mobility) in alkali-earth (Sr2+, Ba2+)-doped layered perovskites based on BaLa2In2O7. It is shown that in the dry air conditions, the nature of conductivity is mixed oxygen–hole, despite the dopant nature. Doping leads to the increase in the conductivity values by up to ~1.5 orders of magnitude. The most proton-conductive BaLa1.7Ba0.3In2O6.85 and BaLa1.7Sr0.15In2O6.925 samples are characterized by the conductivity values 1.2·10−4 S/cm and 0.7·10−4 S/cm at 500 °C under wet air, respectively. The layered perovskites with Ruddlesden-Popper structure, containing two layers of perovskite blocks, are the prospective proton-conducting materials and further material science searches among this class of materials is relevant.
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13
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Double-Bilayer polar nanoregions and Mn antisites in (Ca, Sr) 3Mn 2O 7. Nat Commun 2022; 13:4927. [PMID: 35995791 PMCID: PMC9395386 DOI: 10.1038/s41467-022-32090-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Accepted: 07/14/2022] [Indexed: 11/12/2022] Open
Abstract
The layered perovskite Ca3Mn2O7 (CMO) is a hybrid improper ferroelectric candidate proposed for room temperature multiferroicity, which also displays negative thermal expansion behavior due to a competition between coexisting polar and nonpolar phases. However, little is known about the atomic-scale structure of the polar/nonpolar phase coexistence or the underlying physics of its formation and transition. In this work, we report the direct observation of double bilayer polar nanoregions (db-PNRs) in Ca2.9Sr0.1Mn2O7 using aberration-corrected scanning transmission electron microscopy (S/TEM). In-situ TEM heating experiments show that the db-PNRs can exist up to 650 °C. Electron energy loss spectroscopy (EELS) studies coupled with first-principles calculations demonstrate that the stabilization mechanism of the db-PNRs is directly related to an Mn oxidation state change (from 4+ to 2+), which is linked to the presence of Mn antisite defects. These findings open the door to manipulating phase coexistence and achieving exotic properties in hybrid improper ferroelectric. The competition between the polar and nonpolar phase in the prototypical hybrid improper ferroelectric crystal Ca3Mn2O7 leads to exotic properties. Here, the authors directly imaged the crystal at atomic resolution to understand its nanostructure and discovered the double bilayer polar nanoregion.
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14
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Krasheninnikova O, Syrov E, Smirnov S, Suleimanov E, Fukina D, Knyazev A, Titaev D. Synthesis, crystal structure and photocatalytic activity of new Dion-Jacobson type titanoniobates. J SOLID STATE CHEM 2022. [DOI: 10.1016/j.jssc.2022.123445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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15
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Zhong C, Ishii Y, Tassel C, Zhu T, Kato D, Kurushima K, Fujibayashi Y, Saito T, Ogawa T, Kuwabara A, Mori S, Kageyama H. Lone-Pair-Induced Intra- and Interlayer Polarizations in Sillén-Aurivillius Layered Perovskite Bi 4NbO 8Br. Inorg Chem 2022; 61:9816-9822. [PMID: 35704753 DOI: 10.1021/acs.inorgchem.2c01358] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Sillén-Aurivillius layered perovskite oxyhalides Bi4MO8X (M = Nb, Ta; X = Cl, Br) are of great interest because of their potential as lead-free ferroelectrics in addition to their function as visible-light-responsive photocatalysts. In this work, we revisited the crystal structure of Bi4NbO8Br (space group: P21cn), revealing that the intralayer polarization is not based on the reported NbO6 octahedral tilting but is derived from the stereochemically active Bi3+ lone pair electrons (LPEs) and the octahedral off-centering of Nb5+ cations. The revised structure (space group: Ic) has additional interlayer polarizations (calculated: 0.6 μC/cm2), in agreement with recent experiments on Bi4NbO8Br. The occurrence of polarization due to stereochemically active LPEs and Nb-site off-centering is similar to Aurivillius-type ferroelectrics (e.g., Bi2WO6), with comparable spontaneous polarizations in the in-plane direction (calculated: 43.5 μC/cm2). This, together with the out-of-plane polarization, indicates that Sillén-Aurivillius compounds have great potential as ferroelectric materials.
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Affiliation(s)
- Chengchao Zhong
- Graduate School of Life Sciences, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
| | - Yui Ishii
- Department of Materials Science, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
| | - Cédric Tassel
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Tong Zhu
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Daichi Kato
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | | | - Yukihiro Fujibayashi
- Department of Materials Science, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
| | - Takashi Saito
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tokai, Ibaraki 319-1106, Japan.,Materials and Life Science Division, J-PARC Center, Tokai, Ibaraki 319-1195, Japan.,SOKENDAI (School of High Energy Accelerator Science, The Graduate University for Advanced Studies), Tokai, Ibaraki 319-1195, Japan
| | - Takafumi Ogawa
- Nanostructures Research Laboratory, Japan Fine Ceramics Center, Atsuta-ku, Nagoya 456-8587, Japan
| | - Akihide Kuwabara
- Nanostructures Research Laboratory, Japan Fine Ceramics Center, Atsuta-ku, Nagoya 456-8587, Japan
| | - Shigeo Mori
- Department of Materials Science, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
| | - Hiroshi Kageyama
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
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16
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Cattermull J, Sada K, Hurlbutt K, Cassidy SJ, Pasta M, Goodwin AL. Uncovering the Interplay of Competing Distortions in the Prussian Blue Analogue K 2Cu[Fe(CN) 6]. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2022; 34:5000-5008. [PMID: 35722203 PMCID: PMC9202302 DOI: 10.1021/acs.chemmater.2c00288] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Revised: 05/05/2022] [Indexed: 06/15/2023]
Abstract
We report the synthesis, crystal structure, thermal response, and electrochemical behavior of the Prussian blue analogue (PBA) K2Cu[Fe(CN)6]. From a structural perspective, this is the most complex PBA yet characterized: its triclinic crystal structure results from an interplay of cooperative Jahn-Teller order, octahedral tilts, and a collective "slide" distortion involving K-ion displacements. These different distortions give rise to two crystallographically distinct K-ion channels with different mobilities. Variable-temperature X-ray powder diffraction measurements show that K-ion slides are the lowest-energy distortion mechanism at play, as they are the only distortion to be switched off with increasing temperature. Electrochemically, the material operates as a K-ion cathode with a high operating voltage and an improved initial capacity relative to higher-vacancy PBA alternatives. On charging, K+ ions are selectively removed from a single K-ion channel type, and the slide distortions are again switched on and off accordingly. We discuss the functional importance of various aspects of structural complexity in this system, placing our discussion in the context of other related PBAs.
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Affiliation(s)
- John Cattermull
- Department
of Chemistry, University of Oxford, Inorganic
Chemistry Laboratory, South Parks Road, Oxford OX1 3QR, U.K.
- Department
of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, U.K.
| | - Krishnakanth Sada
- Department
of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, U.K.
| | - Kevin Hurlbutt
- Department
of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, U.K.
| | - Simon J. Cassidy
- Department
of Chemistry, University of Oxford, Inorganic
Chemistry Laboratory, South Parks Road, Oxford OX1 3QR, U.K.
| | - Mauro Pasta
- Department
of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, U.K.
| | - Andrew L. Goodwin
- Department
of Chemistry, University of Oxford, Inorganic
Chemistry Laboratory, South Parks Road, Oxford OX1 3QR, U.K.
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17
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Sha H, Cui J, Yu R. Deep sub-angstrom resolution imaging by electron ptychography with misorientation correction. SCIENCE ADVANCES 2022; 8:eabn2275. [PMID: 35559675 PMCID: PMC9106290 DOI: 10.1126/sciadv.abn2275] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Accepted: 03/30/2022] [Indexed: 05/31/2023]
Abstract
Superresolution imaging of solids is essential to explore local symmetry breaking and derived material properties. Electron ptychography is one of the most promising schemes to realize superresolution imaging beyond aberration correction. However, to reach both deep sub-angstrom resolution imaging and accurate measurement of atomic structures, it is still required for the electron beam to be nearly parallel to the zone axis of crystals. Here, we report an efficient and robust method to correct the specimen misorientation in electron ptychography, giving deep sub-angstrom resolution for specimens with large misorientations. The method largely reduces the experimental difficulties of electron ptychography and paves the way for widespread applications of ptychographic deep sub-angstrom resolution imaging.
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Affiliation(s)
- Haozhi Sha
- National Center for Electron Microscopy in Beijing, Tsinghua University, Beijing 100084, China
- Key Laboratory of Advanced Materials of Ministry of Education of China, Tsinghua University, Beijing 100084, China
- State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, China
- School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
| | - Jizhe Cui
- National Center for Electron Microscopy in Beijing, Tsinghua University, Beijing 100084, China
- Key Laboratory of Advanced Materials of Ministry of Education of China, Tsinghua University, Beijing 100084, China
- State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, China
- School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
| | - Rong Yu
- National Center for Electron Microscopy in Beijing, Tsinghua University, Beijing 100084, China
- Key Laboratory of Advanced Materials of Ministry of Education of China, Tsinghua University, Beijing 100084, China
- State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, China
- School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
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18
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Han C, Bradford AJ, McNulty JA, Zhang W, Halasyamani PS, Slawin AMZ, Morrison FD, Lee SL, Lightfoot P. Polarity and Ferromagnetism in Two-Dimensional Hybrid Copper Perovskites with Chlorinated Aromatic Spacers. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2022; 34:2458-2467. [PMID: 35431437 PMCID: PMC9008537 DOI: 10.1021/acs.chemmater.2c00107] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Revised: 02/08/2022] [Indexed: 06/13/2023]
Abstract
Two-dimensional (2D) organic-inorganic hybrid copper halide perovskites have drawn tremendous attention as promising multifunctional materials. Herein, by incorporating ortho-, meta-, and para-chlorine substitutions in the benzylamine structure, we first report the influence of positional isomerism on the crystal structures of chlorobenzylammonium copper(II) chloride perovskites A2CuCl4. 2D polar ferromagnets (3-ClbaH)2CuCl4 and (4-ClbaH)2CuCl4 (ClbaH+ = chlorobenzylammonium) are successfully obtained. They both adopt a polar monoclinic space group Cc at room temperature, displaying significant differences in crystal structures. In contrast, (2-ClbaH)2CuCl4 adopts a centrosymmetric space group P 21/ c at room temperature. This associated structural evolution successfully enhances the physical properties of the two polar compounds with high thermal stability, discernible second harmonic generation (SHG) signals, ferromagnetism, and narrow optical band gaps. These findings demonstrate that the introduction of chlorine atoms into the interlayer organic species is a powerful tool to tune crystal symmetries and physical properties, and this inspires further exploration of designing high-performance multifunctional copper-based materials.
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Affiliation(s)
- Ceng Han
- School
of Chemistry and EaStChem, University of
St Andrews, St Andrews KY16 9ST, United Kingdom
| | - Alasdair J. Bradford
- School
of Chemistry and EaStChem, University of
St Andrews, St Andrews KY16 9ST, United Kingdom
- School
of Physics, University of St Andrews, St Andrews, Fife KY16 9SS, United Kingdom
| | - Jason A. McNulty
- School
of Chemistry and EaStChem, University of
St Andrews, St Andrews KY16 9ST, United Kingdom
| | - Weiguo Zhang
- Department
of Chemistry, University of Houston, Houston, Texas 77204, United States
| | - P. Shiv Halasyamani
- Department
of Chemistry, University of Houston, Houston, Texas 77204, United States
| | - Alexandra M. Z. Slawin
- School
of Chemistry and EaStChem, University of
St Andrews, St Andrews KY16 9ST, United Kingdom
| | - Finlay D. Morrison
- School
of Chemistry and EaStChem, University of
St Andrews, St Andrews KY16 9ST, United Kingdom
| | - Stephen L. Lee
- School
of Physics, University of St Andrews, St Andrews, Fife KY16 9SS, United Kingdom
| | - Philip Lightfoot
- School
of Chemistry and EaStChem, University of
St Andrews, St Andrews KY16 9ST, United Kingdom
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19
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Han C, McNulty JA, Bradford AJ, Slawin AMZ, Morrison FD, Lee SL, Lightfoot P. Polar Ferromagnet Induced by Fluorine Positioning in Isomeric Layered Copper Halide Perovskites. Inorg Chem 2022; 61:3230-3239. [PMID: 35138839 PMCID: PMC9007457 DOI: 10.1021/acs.inorgchem.1c03726] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We present the influence of positional isomerism on the crystal structure of fluorobenzylammonium copper(II) chloride perovskites A2CuCl4 by incorporating ortho-, meta-, and para-fluorine substitution in the benzylamine structure. Two-dimensional (2D) polar ferromagnet (3-FbaH)2CuCl4 (3-FbaH+ = 3-fluorobenzylammonium) is successfully obtained, which crystallizes in a polar orthorhombic space group Pca21 at room temperature. In contrast, both (2-FbaH)2CuCl4 (2-FbaH+ = 2-fluorobenzylammonium) and (4-FbaH)2CuCl4 (4-FbaH+ = 4-fluorobenzylammonium) crystallize in centrosymmetric space groups P21/c and Pnma at room temperature, respectively, displaying significant differences in crystal structures. These differences indicate that the position of the fluorine atom is a driver for the polar behavior in (3-FbaH)2CuCl4. Preliminary magnetic measurements confirm that these three perovskites possess dominant ferromagnetic interactions within the inorganic [CuCl4]∞ layers. Therefore, (3-FbaH)2CuCl4 is a polar ferromagnet, with potential as a type I multiferroic. This work is expected to promote further development of high-performance 2D copper(II) halide perovskite multiferroic materials.
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Affiliation(s)
- Ceng Han
- School of Chemistry and EaStChem, University of St Andrews, St Andrews KY16 9ST, U.K
| | - Jason A McNulty
- School of Chemistry and EaStChem, University of St Andrews, St Andrews KY16 9ST, U.K
| | - Alasdair J Bradford
- School of Chemistry and EaStChem, University of St Andrews, St Andrews KY16 9ST, U.K.,School of Physics, University of St Andrews, St Andrews, Fife KY16 9SS, U.K
| | - Alexandra M Z Slawin
- School of Chemistry and EaStChem, University of St Andrews, St Andrews KY16 9ST, U.K
| | - Finlay D Morrison
- School of Chemistry and EaStChem, University of St Andrews, St Andrews KY16 9ST, U.K
| | - Stephen L Lee
- School of Physics, University of St Andrews, St Andrews, Fife KY16 9SS, U.K
| | - Philip Lightfoot
- School of Chemistry and EaStChem, University of St Andrews, St Andrews KY16 9ST, U.K
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20
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Mallick S, Zhang W, Batuk M, Gibbs AS, Hadermann J, Halasyamani PS, Hayward MA. The crystal and defect structures of polar KBiNb 2O 7. Dalton Trans 2022; 51:1866-1873. [PMID: 35018920 DOI: 10.1039/d1dt04064b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
KBiNb2O7 was prepared from RbBiNb2O7 by a sequence of cation exchange reactions which first convert RbBiNb2O7 to LiBiNb2O7, before KBiNb2O7 is formed by a further K-for-Li cation exchange. A combination of neutron, synchrotron X-ray and electron diffraction data reveal that KBiNb2O7 adopts a polar, layered, perovskite structure (space group A11m) in which the BiNb2O7 layers are stacked in a (0, ½, z) arrangement, with the K+ cations located in half of the available 10-coordinate interlayer cation sites. The inversion symmetry of the phase is broken by a large displacement of the Bi3+ cations parallel to the y-axis. HAADF-STEM images reveal that KBiNb2O7 exhibits frequent stacking faults which convert the (0, ½, z) layer stacking to (½, 0, z) stacking and vice versa, essentially switching the x- and y-axes of the material. By fitting the complex diffraction peak shape of the SXRD data collected from KBiNb2O7 it is estimated that each layer has approximately a 9% chance of being defective - a high level which is attributed to the lack of cooperative NbO6 tilting in the material, which limits the lattice strain associated with each fault.
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Affiliation(s)
- Subhadip Mallick
- Department of Chemistry, University of Oxford, Inorganic Chemistry Laboratory, South Parks Road, Oxford, OX1 3QR, UK.
| | - Weiguo Zhang
- Department of Chemistry, University of Houston, 112 Fleming Building, Houston, Texas 77204-5003, USA
| | - Maria Batuk
- EMAT, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium
| | - Alexandra S Gibbs
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Oxon OX11 0QX, UK
| | - Joke Hadermann
- EMAT, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium
| | - P Shiv Halasyamani
- Department of Chemistry, University of Houston, 112 Fleming Building, Houston, Texas 77204-5003, USA
| | - Michael A Hayward
- Department of Chemistry, University of Oxford, Inorganic Chemistry Laboratory, South Parks Road, Oxford, OX1 3QR, UK.
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21
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Ludvigsen AC, Lan Z, Castelli IE. Autonomous Design of Photoferroic Ruddlesden-Popper Perovskites for Water Splitting Devices. MATERIALS 2022; 15:ma15010309. [PMID: 35009455 PMCID: PMC8745799 DOI: 10.3390/ma15010309] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Revised: 12/22/2021] [Accepted: 12/28/2021] [Indexed: 02/04/2023]
Abstract
The use of ferroelectric materials for light-harvesting applications is a possible solution for increasing the efficiency of solar cells and photoelectrocatalytic devices. In this work, we establish a fully autonomous computational workflow to identify light-harvesting materials for water splitting devices based on properties such as stability, size of the band gap, position of the band edges, and ferroelectricity. We have applied this workflow to investigate the Ruddlesden-Popper perovskite class and have identified four new compositions, which show a theoretical efficiency above 5%.
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22
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Oxide and Organic–Inorganic Halide Perovskites with Plasmonics for Optoelectronic and Energy Applications: A Contributive Review. Catalysts 2021. [DOI: 10.3390/catal11091057] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The ascension of halide perovskites as outstanding materials for a wide variety of optoelectronic applications has been reported in recent years. They have shown significant potential for the next generation of photovoltaics in particular, with a power conversion efficiency of 25.6% already achieved. On the other hand, oxide perovskites have a longer history and are considered as key elements in many technological applications; they have been examined in depth and applied in various fields, owing to their exceptional variability in terms of compositions and structures, leading to a large set of unique physical and chemical properties. As of today, a sound correlation between these two important material families is still missing, and this contributive review aims to fill this gap. We report a detailed analysis of the main functions and properties of oxide and organic–inorganic halide perovskite, emphasizing existing relationships amongst the specific performance and the structures.
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23
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Li S, Birol T. Free-Carrier-Induced Ferroelectricity in Layered Perovskites. PHYSICAL REVIEW LETTERS 2021; 127:087601. [PMID: 34477429 DOI: 10.1103/physrevlett.127.087601] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Accepted: 07/19/2021] [Indexed: 06/13/2023]
Abstract
Doping ferroelectrics with carriers is often detrimental to polarization. This makes the design and discovery of metals that undergo a ferroelectriclike transition challenging. In this Letter, we show from first principles that the oxygen octahedral rotations in perovskites are often enhanced by electron doping, and this can be used as a means to strengthen the structural polarization in certain hybrid-improper ferroelectrics-compounds in which the polarization is not stabilized by the long-range Coulomb interactions but is instead induced by a trilinear coupling to octahedral rotations. We use this design strategy to predict a cation ordered Ruddlesden-Popper compound that can be driven into a metallic ferroelectriclike phase via electrolyte gating.
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Affiliation(s)
- Shutong Li
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - Turan Birol
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USA
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24
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Han C, Bradford AJ, Slawin AMZ, Bode BE, Fusco E, Lee SL, Tang CC, Lightfoot P. Structural Features in Some Layered Hybrid Copper Chloride Perovskites: ACuCl 4 or A 2CuCl 4. Inorg Chem 2021; 60:11014-11024. [PMID: 34242021 DOI: 10.1021/acs.inorgchem.1c00705] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We present three new hybrid copper(II) chloride layered perovskites of generic composition ACuCl4 or A2CuCl4, which exhibit three distinct structure types. (m-PdH2)CuCl4 (m-PdH22+ = protonated m-phenylenediamine) adopts a Dion-Jacobson (DJ)-like layered perovskite structure type and exhibits a very large axial thermal contraction effect upon heating, as revealed via variable-temperature synchrotron X-ray powder diffraction (SXRD). This can be attributed to the contraction of an interlayer block, via a slight repositioning of the m-PdH22+ moiety. (3-AbaH)2CuCl4 (3-AbaH+ = protonated 3-aminobenzoic acid) and (4-AbaH)2CuCl4 (4-AbaH+ = protonated 4-aminobenzoic acid) possess the same generic formula as Ruddlesden-Popper (RP) layered perovskites, A2BX4, but adopt different structures. (4-AbaH)2CuCl4 adopts a near-staggered structure type, whereas (3-AbaH)2CuCl4 adopts a near-eclipsed structure type, which resembles the DJ rather than the RP family. (3-AbaH)2CuCl4 also displays static disorder of the [CuCl4]∞ layers. The crystal structures of each are discussed in terms of the differing nature of the templating molecular species, and these are compared to related layered perovskites. Preliminary magnetic measurements are reported, suggesting dominant ferromagnetic interactions.
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Affiliation(s)
- Ceng Han
- School of Chemistry and EaStChem, University of St Andrews, St Andrews, KY16 9ST, United Kingdom
| | - Alasdair J Bradford
- School of Chemistry and EaStChem, University of St Andrews, St Andrews, KY16 9ST, United Kingdom.,School of Physics, University of St Andrews, St Andrews, Fife KY16 9SS, United Kingdom
| | - Alexandra M Z Slawin
- School of Chemistry and EaStChem, University of St Andrews, St Andrews, KY16 9ST, United Kingdom
| | - Bela E Bode
- School of Chemistry and EaStChem, University of St Andrews, St Andrews, KY16 9ST, United Kingdom
| | - Edoardo Fusco
- School of Chemistry and EaStChem, University of St Andrews, St Andrews, KY16 9ST, United Kingdom
| | - Stephen L Lee
- School of Physics, University of St Andrews, St Andrews, Fife KY16 9SS, United Kingdom
| | - Chiu C Tang
- Diamond Light Source Ltd, Didcot, OX11 0DE, United Kingdom
| | - Philip Lightfoot
- School of Chemistry and EaStChem, University of St Andrews, St Andrews, KY16 9ST, United Kingdom
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25
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Prajapat D, Surampalli A, Schiesaro I, Kaushik SD, Meneghini C, Sagdeo A, Sathe VG, Siruguri V, Welter E, Reddy VR. Lattice assisted dielectric relaxation in four-layer Aurivillius Bi 5FeTi 3O 15ceramic at low temperatures. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:355803. [PMID: 34139675 DOI: 10.1088/1361-648x/ac0c3b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Accepted: 06/17/2021] [Indexed: 06/12/2023]
Abstract
We have investigated magnetic, structural and dielectric properties of Bi5FeTi3O15(BFTO) in the temperature range 5K-300 K. Using diffraction, Raman spectroscopy and x-ray absorption fine structure measurements, iso-structural modifications are observed at low temperatures (≈100 K). The analysis of dielectric constant data revealed signatures of dielectric relaxation, concomitant with these structural modifications in BFTO at the same temperatures. Further, employing complementary experimental methods, it is shown that the distribution of Fe/Ti ions in BFTO is random. With the help of techniques that probe magnetism at various length and time scales, it is shown that the phase-pure BFTO is non-magnetic down to the lowest temperatures.
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Affiliation(s)
- Deepak Prajapat
- UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452001, India
| | - Akash Surampalli
- UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452001, India
| | - Irene Schiesaro
- Dipartimento di Scienze, Universita di Roma Tre, I-00146 Roma, Italy
| | - S D Kaushik
- UGC-DAE Consortium for Scientific Research, Mumbai Centre, R-5 Shed, BARC, Mumbai-400085, India
| | - Carlo Meneghini
- Dipartimento di Scienze, Universita di Roma Tre, I-00146 Roma, Italy
| | - Archna Sagdeo
- Synchrotrons Utilization Section, RRCAT, Indore, India
- Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai 400094, India
| | - V G Sathe
- UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452001, India
| | - V Siruguri
- UGC-DAE Consortium for Scientific Research, Mumbai Centre, R-5 Shed, BARC, Mumbai-400085, India
| | - Edmund Welter
- Deutsches Elektronen-Synchrotron-A Research Centre of the Helmholtz Association, Hamburg 22607, Germany
| | - V Raghavendra Reddy
- UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452001, India
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26
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McNulty JA, Lightfoot P. Structural chemistry of layered lead halide perovskites containing single octahedral layers. IUCRJ 2021; 8:485-513. [PMID: 34258000 PMCID: PMC8256700 DOI: 10.1107/s2052252521005418] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Accepted: 05/24/2021] [Indexed: 06/01/2023]
Abstract
We present a comprehensive review of the structural chemistry of hybrid lead halides of stoichiometry APbX 4, A 2PbX4 or A A'PbX 4, where A and A' are organic ammonium cations and X = Cl, Br or I. These compounds may be considered as layered perovskites, containing isolated, infinite layers of corner-sharing PbX 4 octahedra separated by the organic species. First, over 250 crystal structures were extracted from the CCDC and classified in terms of unit-cell metrics and crystal symmetry. Symmetry mode analysis was then used to identify the nature of key structural distortions of the [PbX 4]∞ layers. Two generic types of distortion are prevalent in this family: tilting of the octahedral units and shifts of the inorganic layers relative to each other. Although the octahedral tilting modes are well known in the crystallography of purely inorganic perovskites, the additional layer-shift modes are shown to enormously enrich the structural options available in layered hybrid perovskites. Some examples and trends are discussed in more detail in order to show how the nature of the interlayer organic species can influence the overall structural architecture; although the main aim of the paper is to encourage workers in the field to make use of the systematic crystallographic methods used here to further understand and rationalize their own compounds, and perhaps to be able to design-in particular structural features in future work.
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Affiliation(s)
- Jason A. McNulty
- School of Chemistry, University of St Andrews, St Andrews KY16 9ST, United Kingdom
| | - Philip Lightfoot
- School of Chemistry, University of St Andrews, St Andrews KY16 9ST, United Kingdom
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27
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Gelves-Badillo JS, Romero AH, Garcia-Castro AC. Unveiling the mechanisms behind the ferroelectric response in the Sr(Nb,Ta)O 2N oxynitrides. Phys Chem Chem Phys 2021; 23:17142-17149. [PMID: 34179906 DOI: 10.1039/d1cp01716k] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Oxynitride perovskites of the type ABO2N have attracted considerable attention thanks to their potential ferroelectric behavior and tunable bandgap energy, making them ideal candidates for photocatalysis processes. Therefore, in order to shed light on the origin of their ferroelectric response, here we report a complete analysis of the structural and vibrational properties of SrNbO2N and SrTaO2N oxynitrides. By employing first-principles calculations, we analyzed the symmetry in-equivalent structures considering the experimentally reported parent I4/mcm space group (with a phase a0a0c- in Glazer's notation). Based on the I4/mcm reference within the 20-atoms unit-cell, we found and studied the ensemble of structures where different octahedral anionic orderings are allowed by symmetry. Thus, by exploring the vibrational landscape of the cis- and trans-type configuration structures and supported by the ionic eigendisplacements and the Born effective charges, we explained the mechanism responsible for the appearance of stable ferroelectric phases in both anionic orderings. The latter goes from covalent-driven in the trans-type ordering to the geometrically-driven in the cis-type configuration. Finally, we found in both cases that the biaxial xy epitaxial strain considerably enhances such ferroelectric response.
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Affiliation(s)
- J S Gelves-Badillo
- School of Physics, Universidad Industrial de Santander, Carrera 27 Calle 09, 680002, Bucaramanga, Colombia.
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28
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Markov M, Alaerts L, Miranda HPC, Petretto G, Chen W, George J, Bousquet E, Ghosez P, Rignanese GM, Hautier G. Ferroelectricity and multiferroicity in anti-Ruddlesden-Popper structures. Proc Natl Acad Sci U S A 2021; 118:e2026020118. [PMID: 33893238 PMCID: PMC8092399 DOI: 10.1073/pnas.2026020118] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Combining ferroelectricity with other properties such as visible light absorption or long-range magnetic order requires the discovery of new families of ferroelectric materials. Here, through the analysis of a high-throughput database of phonon band structures, we identify a structural family of anti-Ruddlesden-Popper phases [Formula: see text]O (A=Ca, Sr, Ba, Eu, X=Sb, P, As, Bi) showing ferroelectric and antiferroelectric behaviors. The discovered ferroelectrics belong to the new class of hyperferroelectrics that polarize even under open-circuit boundary conditions. The polar distortion involves the movement of O anions against apical A cations and is driven by geometric effects resulting from internal chemical strains. Within this structural family, we show that [Formula: see text]O combines coupled ferromagnetic and ferroelectric order at the same atomic site, a very rare occurrence in materials physics.
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Affiliation(s)
- Maxime Markov
- Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium
| | - Louis Alaerts
- Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium
- Thayer School of Engineering, Dartmouth College, Hanover, NH 03755
| | | | - Guido Petretto
- Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium
| | - Wei Chen
- Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium
| | - Janine George
- Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium
| | - Eric Bousquet
- Theoretical Materials Physics, Quantum Materials Center (Q-MAT), Complex and Entangled Systems from Atoms to Materials (CESAM), Université de Liège, B-4000 Liège, Belgium
| | - Philippe Ghosez
- Theoretical Materials Physics, Quantum Materials Center (Q-MAT), Complex and Entangled Systems from Atoms to Materials (CESAM), Université de Liège, B-4000 Liège, Belgium
| | - Gian-Marco Rignanese
- Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium
| | - Geoffroy Hautier
- Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium;
- Thayer School of Engineering, Dartmouth College, Hanover, NH 03755
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29
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Yang Y, Lou F, Xiang H. Cooperative Nature of Ferroelectricity in Two-Dimensional Hybrid Organic-Inorganic Perovskites. NANO LETTERS 2021; 21:3170-3176. [PMID: 33754732 DOI: 10.1021/acs.nanolett.1c00395] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Two-dimensional (2D) ferroelectric (FE) hybrid organic-inorganic perovskites (HOIPs) are promising for potential applications as miniaturized flexible ferroelectric/piezoelectric devices. Recently, several 2D HOIPs [e.g., Ruddlensden-Popper type HOIP BA2PbCl4 (BA = C6H5CH2NH3+)] were reported to possess room-temperature ferroelectricity. However, the underlying microscopic mechanisms for ferroelectricity in 2D HOIPs remain elusive. Here, by performing first-principles calculations and symmetry mode analysis, we demonstrate that there exists a cooperative coupling between A-site organic molecules and B-site inorganic Pb2+ ions that is essential to the ferroelectricity in 2D BA2PbCl4. The nonpolar ground state of the closely related compounds BA2PbBr4 and BA2PbI4 can also be explained in terms of the weakened cooperative coupling. We further predict that 2D BA2PbF4 displays in-plane ferroelectricity with a higher Curie temperature and larger electric polarization. Our work not only reveals the unusual FE mechanism in 2D HOIPs but also provides a solid theoretical basis for the rational design of 2D multifunctional materials.
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Affiliation(s)
- Yali Yang
- Key Laboratory of Computational Physical Sciences (Ministry of Education), State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200433, People's Republic of China
- Shanghai Qizhi Institution, Shanghai 200232, People's Republic of China
| | - Feng Lou
- Key Laboratory of Computational Physical Sciences (Ministry of Education), State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200433, People's Republic of China
- Shanghai Qizhi Institution, Shanghai 200232, People's Republic of China
| | - Hongjun Xiang
- Key Laboratory of Computational Physical Sciences (Ministry of Education), State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200433, People's Republic of China
- Shanghai Qizhi Institution, Shanghai 200232, People's Republic of China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, People's Republic of China
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30
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Qi L, Ruan S, Zeng YJ. Review on Recent Developments in 2D Ferroelectrics: Theories and Applications. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2005098. [PMID: 33577141 DOI: 10.1002/adma.202005098] [Citation(s) in RCA: 66] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 09/28/2020] [Indexed: 06/12/2023]
Abstract
Although only a few 2D materials have been predicted to possess ferroelectricity, 2D ferroelectrics are expected to play a dominant role in the upcoming nano era as important functional materials. The ferroelectric properties of 2D ferroelectrics are significantly different than those of traditional bulk ferroelectrics owing to their intrinsic size and surface effects. To date, 2D ferroelectrics have been reported to exhibit diverse properties ranging from bulk photovoltaic and piezoelectric/pyroelectric effects to the spontaneous valley and spin polarization. These properties are either dependent on ferroelectric polarization or coupled with it for easy electric control, thus making 2D ferroelectrics applicable to multifunctional nanodevices. At present, cumulative efforts are being made to explore 2D ferroelectrics in theories, experiments, and applications. Herein, such theories and methods are briefly introduced. Subsequently, intrinsic and extrinsic origins of 2D ferroelectricity are separately summarized. In addition, invented or laboratory-validated 2D ferroelectric-based applications are listed. Finally, the existing challenges and prospects of 2D ferroelectrics are discussed.
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Affiliation(s)
- Lu Qi
- Key laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, P. R. China
| | - Shuangchen Ruan
- College of New Materials and New Energies, Shenzhen Technology University, Shenzhen, 518118, P. R. China
| | - Yu-Jia Zeng
- Key laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, P. R. China
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31
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Khan MS, Osada M, Dong L, Kim YH, Ebina Y, Sasaki T. Rational Assembly of Two-Dimensional Perovskite Nanosheets as Building Blocks for New Ferroelectrics. ACS APPLIED MATERIALS & INTERFACES 2021; 13:1783-1790. [PMID: 33347270 DOI: 10.1021/acsami.0c16967] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Artificial materials in the form of superlattices have been studied actively in quest of new engineering methods or design rules for the development of desired functionalities, in particular high-k ferroelectricity, ferromagnetism, and high mobility electron gas. This work presents a controlled assembly strategy for fabricating atomically precise interfaces of two-dimensional (2D) homologous perovskite nanosheets (Ca2Nam-3NbmO3m+1-; m = 3-6) to construct artificial superlattices. The distinctive thickness of each 2D homologous perovskite nanosheets attributed to the presence of different number of NbO6 octahedra provides an exquisite control to engineer interfacial properties for tailored design of superior high-k properties and emergence of ferroelectricity. The higher dielectric constant (εr = 427) and development of ferroelectricity for (Ca2Nb3O10-/Ca2Na2Nb5O16-)6 superlattice indicate that superlattice films with both odd number of NbO6 octahedra possess extended polarization due to the potential effect of heterointerface and ferroelectric instabilities. Furthermore, the increased discontinuities/offsets in Ca2Nb3O10- and Ca2Na3Nb6O19- nanosheets band alignment results in superior insulating properties (∼1 × 10-11 A cm-2 at 1 V) for (Ca2Nb3O10-/Ca2Na3Nb6O19-)6 superlattice. These findings exhibit new research opportunities for the development of novel artificial high-k dielectric/ferroelectric via precise control of interfaces at the atomic level and can be extended to the large family of 2D perovskite compounds.
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Affiliation(s)
- Muhammad Shuaib Khan
- International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan
- Department of Nanoscience and Engineering, Waseda University, Shinjyuku, Tokyo 169-8555, Japan
| | - Minoru Osada
- International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan
- Department of Nanoscience and Engineering, Waseda University, Shinjyuku, Tokyo 169-8555, Japan
| | - Lei Dong
- International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan
- Department of Nanoscience and Engineering, Waseda University, Shinjyuku, Tokyo 169-8555, Japan
| | - Yoon-Hyun Kim
- International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan
| | - Yasuo Ebina
- International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan
| | - Takayoshi Sasaki
- International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan
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32
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Gradauskaite E, Meisenheimer P, Müller M, Heron J, Trassin M. Multiferroic heterostructures for spintronics. PHYSICAL SCIENCES REVIEWS 2020. [DOI: 10.1515/psr-2019-0072] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
AbstractFor next-generation technology, magnetic systems are of interest due to the natural ability to store information and, through spin transport, propagate this information for logic functions. Controlling the magnetization state through currents has proven energy inefficient. Multiferroic thin-film heterostructures, combining ferroelectric and ferromagnetic orders, hold promise for energy efficient electronics. The electric field control of magnetic order is expected to reduce energy dissipation by 2–3 orders of magnitude relative to the current state-of-the-art. The coupling between electrical and magnetic orders in multiferroic and magnetoelectric thin-film heterostructures relies on interfacial coupling though magnetic exchange or mechanical strain and the correlation between domains in adjacent functional ferroic layers. We review the recent developments in electrical control of magnetism through artificial magnetoelectric heterostructures, domain imprint, emergent physics and device paradigms for magnetoelectric logic, neuromorphic devices, and hybrid magnetoelectric/spin-current-based applications. Finally, we conclude with a discussion of experiments that probe the crucial dynamics of the magnetoelectric switching and optical tuning of ferroelectric states towards all-optical control of magnetoelectric switching events.
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Affiliation(s)
- Elzbieta Gradauskaite
- Department of Materials , ETH Zurich , Vladimir-Prelog-Weg 4 , Zurich , 8093 Switzerland
| | - Peter Meisenheimer
- Department of Materials Science and Engineering , University of Michigan , Ann Arbor , MI 48109 USA
| | - Marvin Müller
- Department of Materials , ETH Zurich , Vladimir-Prelog-Weg 4 , Zurich , 8093 Switzerland
| | - John Heron
- Department of Materials Science and Engineering , University of Michigan , Ann Arbor , MI 48109 USA
| | - Morgan Trassin
- Department of Materials , ETH Zurich , Vladimir-Prelog-Weg 4 , Zurich , 8093 Switzerland
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33
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Cascos V, Roberts-Watts J, Skingle C, Levin I, Zhang W, Halasyamani PS, Stennett MC, Hyatt NC, Bousquet E, McCabe EE. Tuning between Proper and Hybrid-Improper Mechanisms for Polar Behavior in Cs Ln 2Ti 2NbO 10 Dion-Jacobson Phases. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2020; 32:8700-8712. [PMID: 33122876 PMCID: PMC7587150 DOI: 10.1021/acs.chemmater.0c03326] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/14/2020] [Revised: 09/22/2020] [Indexed: 06/11/2023]
Abstract
The Dion-Jacobson (DJ) family of perovskite-related materials have recently attracted interest due to their polar structures and properties, resulting from hybrid-improper mechanisms for ferroelectricity in n = 2 systems and from proper mechanisms in n = 3 CsBi2Ti2NbO10. We report here a combined experimental and computational study on analogous n = 3 CsLn 2Ti2NbO10 (Ln = La, Nd) materials. Density functional theory calculations reveal the shallow energy landscape in these systems and give an understanding of the competing structural models suggested by neutron and electron diffraction studies. The structural disorder resulting from the shallow energy landscape breaks inversion symmetry at a local level, consistent with the observed second-harmonic generation. This study reveals the potential to tune between proper and hybrid-improper mechanisms by composition in the DJ family. The disorder and shallow energy landscape have implications for designing functional materials with properties reliant on competing low-energy phases such as relaxors and antiferroelectrics.
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Affiliation(s)
- Vanessa
A. Cascos
- School
of Physical Sciences, University of Kent, Canterbury Kent CT2 7NH, U. K.
| | | | - Chloe Skingle
- School
of Physical Sciences, University of Kent, Canterbury Kent CT2 7NH, U. K.
| | - Igor Levin
- Materials
Measurement Science Division, NIST, Gaithersburg, Maryland 20899, United States
| | - Weiguo Zhang
- Department
of Chemistry, University of Houston, 112 Fleming Building, Houston, Texas 77204, United States
| | - P. Shiv Halasyamani
- Department
of Chemistry, University of Houston, 112 Fleming Building, Houston, Texas 77204, United States
| | - Martin C. Stennett
- Department
of Materials Sciences and Engineering, University
of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield S1 3JD, U. K.
| | - Neil C. Hyatt
- Department
of Materials Sciences and Engineering, University
of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield S1 3JD, U. K.
| | - Eric Bousquet
- Physique
Théorique des Matériaux, Q-MAT, CESAM, Université de Liège, Allée du 6 août 19, B-4000 Sart Tilman, Belgium
| | - Emma E. McCabe
- School
of Physical Sciences, University of Kent, Canterbury Kent CT2 7NH, U. K.
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34
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Zhang Y, Wang J, Ghosez P. Unraveling the Suppression of Oxygen Octahedra Rotations in A_{3}B_{2}O_{7} Ruddlesden-Popper Compounds: Engineering Multiferroicity and Beyond. PHYSICAL REVIEW LETTERS 2020; 125:157601. [PMID: 33095620 DOI: 10.1103/physrevlett.125.157601] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Accepted: 08/11/2020] [Indexed: 06/11/2023]
Abstract
The competition between polar distortions and BO_{6} octahedra rotations is well known to be critical in explaining the ground state of various ABO_{3} perovskites. Here, we show from first-principles calculations that a similar competition between interlayer rumpling and rotations is playing a key role in layered Ruddlesden-Popper (RP) perovskites. This competition explains the suppression of oxygen octahedra rotations and hybrid improper ferroelectricity in A_{3}B_{2}O_{7} compounds with rare-earth ions in the rocksalt layer and also appears relevant to other phenomena like negative thermal expansion and the dimensionality determined band gap in RP systems. Moreover, we highlight that RP perovskites offer more flexibility than ABO_{3} perovskites in controlling such a competition and four distinct strategies are proposed to tune it. These strategies are shown to be promising for designing new multiferroics. They are generic and might also be exploited for tuning negative thermal expansion and band gap.
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Affiliation(s)
- Yajun Zhang
- Theoretical Materials Physics, Q-MAT, CESAM, Université de Liège, B-4000 Liège, Belgium
- Department of Engineering Mechanics and Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China
| | - Jie Wang
- Department of Engineering Mechanics and Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China
| | - Philippe Ghosez
- Theoretical Materials Physics, Q-MAT, CESAM, Université de Liège, B-4000 Liège, Belgium
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35
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Yang Y, Mao H, Wang J, Zhang Q, Jin L, Wang C, Zhang Y, Su N, Meng F, Yang Y, Xia R, Chen R, Zhu H, Gu L, Yin Z, Nan CW, Zhang J. Large Switchable Photoconduction within 2D Potential Well of a Layered Ferroelectric Heterostructure. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e2003033. [PMID: 32729146 DOI: 10.1002/adma.202003033] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Indexed: 06/11/2023]
Abstract
The coexistence of large conductivity and robust ferroelectricity is promising for high-performance ferroelectric devices based on polarization-controllable highly efficient carrier transport. Distinct from traditional perovskite ferroelectrics, Bi2 WO6 with a layered structure shows a great potential to preserve its ferroelectricity under substantial electron doping. Herein, by artificial design of photosensitive heterostructures with desired band alignment, three orders of magnitude enhancement of the short-circuit photocurrent is achieved in Bi2 WO6 /SrTiO3 at room temperature. The microscopic mechanism of this large photocurrent originates from separated transport of electrons and holes in [WO4 ]-2 and [Bi2 O2 ]+2 layers respectively with a large in-plane conductivity, which is understood by a combination of ab initio calculations and spectroscopic measurements. The layered electronic structure and appropriately designed band alignment in this layered ferroelectric heterostructure provide an opportunity to achieve high-performance and nonvolatile switchable electronic devices.
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Affiliation(s)
- Yuben Yang
- Department of Physics, Beijing Normal University, Beijing, 100875, China
| | - Huican Mao
- Department of Physics, Beijing Normal University, Beijing, 100875, China
| | - Jing Wang
- School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
- Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing, 100081, China
| | - Qinghua Zhang
- Institute of Physics, Chinese Academy of Science, Beijing, 100190, China
| | - Lei Jin
- Faculty of Information Technology, Beijing University of Technology, Beijing, 100124, China
| | - Chuanshou Wang
- Department of Physics, Beijing Normal University, Beijing, 100875, China
| | - Yuelin Zhang
- Department of Physics, Beijing Normal University, Beijing, 100875, China
| | - Nan Su
- Department of Physics, Beijing Normal University, Beijing, 100875, China
| | - Fanqi Meng
- Institute of Physics, Chinese Academy of Science, Beijing, 100190, China
| | - Ying Yang
- Department of Physics, Beijing Normal University, Beijing, 100875, China
| | - Ruqiao Xia
- Department of Physics, Beijing Normal University, Beijing, 100875, China
- Department of Physics and Astronomy, University of Manchester, Oxford Rd, Manchester, M13 9PL, UK
| | - Rongyan Chen
- Department of Physics, Beijing Normal University, Beijing, 100875, China
| | - Hui Zhu
- Faculty of Information Technology, Beijing University of Technology, Beijing, 100124, China
| | - Lin Gu
- Institute of Physics, Chinese Academy of Science, Beijing, 100190, China
| | - Zhiping Yin
- Department of Physics, Beijing Normal University, Beijing, 100875, China
| | - Ce-Wen Nan
- School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
| | - Jinxing Zhang
- Department of Physics, Beijing Normal University, Beijing, 100875, China
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36
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Guo YY, Yang LJ, Biberger S, McNulty JA, Li T, Schötz K, Panzer F, Lightfoot P. Structural Diversity in Layered Hybrid Perovskites, A 2PbBr 4 or AA'PbBr 4, Templated by Small Disc-Shaped Amines. Inorg Chem 2020; 59:12858-12866. [PMID: 32805998 DOI: 10.1021/acs.inorgchem.0c01807] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
We present three new hybrid layered lead(II) bromide perovskites of generic composition A2PbBr4 or AA'PbBr4 that exhibit three distinct structure types. [TzH]2PbBr4 ([TzH+] = 1,2,4-triazolium) adopts a (001)-oriented layer structure and [AaH]2PbBr4, ([AaH+] = acetamidinium) adopts a (110)-oriented type, whereas [ImH][TzH]PbBr4, ([ImH+] = imidazolium) adopts a rare (110)-oriented structure with enhanced corrugation (i.e., 3 × 3 type). The crystal structures of each are discussed in terms of the differing nature of the templating molecular species. Photoluminescent spectra for each are reported and the behaviors discussed in relation to the different structure of each composition.
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Affiliation(s)
- Yuan-Yuan Guo
- School of Chemistry and EaStChem, University of St. Andrews, St. Andrews KY16 9ST, United Kingdom
| | - Lin-Jie Yang
- School of Chemistry and EaStChem, University of St. Andrews, St. Andrews KY16 9ST, United Kingdom
| | - Simon Biberger
- Soft Matter Optoelectronics, Department of Physics, University of Bayreuth, Bayreuth 95440, Germany
| | - Jason A McNulty
- School of Chemistry and EaStChem, University of St. Andrews, St. Andrews KY16 9ST, United Kingdom
| | - Teng Li
- School of Chemistry and EaStChem, University of St. Andrews, St. Andrews KY16 9ST, United Kingdom
| | - Konstantin Schötz
- Soft Matter Optoelectronics, Department of Physics, University of Bayreuth, Bayreuth 95440, Germany
| | - Fabian Panzer
- Soft Matter Optoelectronics, Department of Physics, University of Bayreuth, Bayreuth 95440, Germany
| | - Philip Lightfoot
- School of Chemistry and EaStChem, University of St. Andrews, St. Andrews KY16 9ST, United Kingdom
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Ter-Oganessian NV, Sakhnenko VP. Hidden improper ferroelectric phases for design of antiferroelectrics. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2020; 32:275401. [PMID: 32120349 DOI: 10.1088/1361-648x/ab7ba3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Strong anomalous increase of the dielectric constant across a structural phase transition between two centrosymmetric phases, commonly observed in various crystals including prominent antiferroelectrics, is shown to originate from the hidden improper ferroelectric phases. In the vicinity of the phase transition double hysteresis loops of electric polarization vs electric field should be observed, which can be used for targeted design of antiferroelectric compounds. The suggested mechanism is illustrated by theoretical explanation of the recently discovered antiferroelectricity in the Ruddlesden-Popper compound ((CH3)2CHCH2NH3)2CsPb2Br7. Implications of the suggested models for the phase transition between the R and P phases in NaNbO3 are discussed.
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Affiliation(s)
- N V Ter-Oganessian
- Institute of Physics, Southern Federal University, 194 Stachki Pr., 344090 Rostov-on-Don, Russia
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38
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Atri S, Pokhriyal M, Uma S. Synergistic Influence of d 0 (Nb 5+) and d 10 (Cd 2+) Cations in Stabilizing Noncentrosymmetric Dion-Jacobson Layered Perovskites, A'Cd 2Nb 3O 10 (A' = Rb, Cs). Inorg Chem 2020; 59:8044-8053. [PMID: 32463227 DOI: 10.1021/acs.inorgchem.0c00291] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
New Dion-Jacobson (n = 3) layered perovskites, A'Cd2Nb3O10 (A' = Rb, Cs), have been synthesized by a solid-state method. Powder X-ray diffraction measurements confirm the noncentrosymmetric orthorhombic (space group Ima2) structures for both rubidium- and cesium-containing layered oxides. The distorted octahedral coordination of the d0 metal cations (Nb5+) coupled with the increased covalency in the lattice by the introduction of d10 metal cations (Cd2+) is responsible for the acentric structures. The resulting second-harmonic-generation (SHG) efficiencies of the polycrystalline samples (size 45-63 μm) using 1064 nm radiation reveal comparable values for CsCd2Nb3O10 and nearly 5 times higher output values for RbCd2Nb3O10 with respect to potassium dihydrogen phosphate. These structures were further confirmed from transmission electron microscopy and Raman spectroscopy measurements. The optical characteristics show interesting variations to the expected photocatalytic activities. Ion-exchange reactions result in the synthesis of proton- and lithium-containing oxides, which are otherwise inaccessible by direct solid-state reactions. The mobilities of the interlayer ions have also been confirmed by ionic conductivity measurements.
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Affiliation(s)
- Shalu Atri
- Materials Chemistry Group, Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Meenakshi Pokhriyal
- Materials Chemistry Group, Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Sitharaman Uma
- Materials Chemistry Group, Department of Chemistry, University of Delhi, Delhi 110007, India
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39
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Varignon J, Bristowe NC, Bousquet E, Ghosez P. Magneto-electric multiferroics: designing new materials from first-principles calculations. PHYSICAL SCIENCES REVIEWS 2020. [DOI: 10.1515/psr-2019-0069] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
In parallel with the revival of interest for magneto-electric multiferroic materials in the beginning of the century, first-principles simulations have grown incredibly in efficiency during the last two decades. Density functional theory calculations, in particular, have so become a must-have tool for physicists and chemists in the multiferroic community. While these calculations were originally used to support and explain experimental behaviour, their interest has progressively moved to the design of novel magneto-electric multiferroic materials. In this article, we mainly focus on oxide perovskites, an important class of multifunctional material, and review some significant advances to which contributed first-principles calculations. We also briefly introduce the various theoretical developments that were at the core of all these advances.
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40
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Guo YY, Yang LJ, McNulty JA, Slawin AMZ, Lightfoot P. Structural variations in (001)-oriented layered lead halide perovskites, templated by 1,2,4-triazolium. Dalton Trans 2020; 49:17274-17280. [PMID: 33201957 DOI: 10.1039/d0dt02936j] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new hybrid lead(ii) halide perovskite, (TzH)2PbCl4, ([TzH+] = 1,2,4-triazolium), adopts a (001)-oriented layered perovskite structure, which can be considered as derived from the n = 1 Ruddlesden-Popper (RP) type. Variable temperature single crystal X-ray diffraction reveals a structural phase transition in the region 125 K < T < 173 K between a high temperature, high symmetry polymorph, space group Cmcm, and a low temperature, low symmetry chiral polymorph, space group P212121, which has a tripled unit cell volume. UV-Vis spectra suggest a band gap of 3.30 eV for (TzH)2PbCl4. A second polymorph of the bromide analogue, (TzH)2PbBr4-II, is also reported, and structural relationships between all three variants are discussed.
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Affiliation(s)
- Yuan-Yuan Guo
- School of Chemistry and EaStChem, University of St Andrews, St Andrews, KY16 9ST, UK.
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41
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Shirokov VB, Talanov MV. Phase transitions in Bi 4Ti 3O 12. ACTA CRYSTALLOGRAPHICA SECTION B, STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS 2019; 75:978-986. [PMID: 32830677 DOI: 10.1107/s2052520619011843] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Accepted: 08/28/2019] [Indexed: 06/11/2023]
Abstract
Bi4Ti3O12 is a representative of the Aurivillius family of layered perovskites. These are high-temperature ferroelectric materials with prospects for applications in random-access memory and are characterized by an extremely confused interaction of their structural degrees of freedom. Using group-theoretical methods, structural distortions in the Bi4Ti3O12 high-symmetry phase, caused by rotations of rigid octahedra and their displacements as a single unit, have been investigated, taking into account the connections between them. Within the Landau theory, a stable thermodynamic model of phase transitions with three order parameters has been constructed. It is shown that, according to the phenomenological phase diagram, the transition between the high-temperature tetragonal phase and the low-temperature ferroelectric can occur both directly and through intermediate states, including those observed experimentally. The role of improper ordered parameters and possible domain configurations in the structure formation of the low-temperature ferroelectric phase are discussed.
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Affiliation(s)
- Vladimir B Shirokov
- South Scientific Center, Russian Academy of Sciences, Rostov-on-Don, Russian Federation
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42
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Infrared nano-spectroscopy of ferroelastic domain walls in hybrid improper ferroelectric Ca 3Ti 2O 7. Nat Commun 2019; 10:5235. [PMID: 31748506 PMCID: PMC6868197 DOI: 10.1038/s41467-019-13066-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2019] [Accepted: 10/07/2019] [Indexed: 02/01/2023] Open
Abstract
Ferroic materials are well known to exhibit heterogeneity in the form of domain walls. Understanding the properties of these boundaries is crucial for controlling functionality with external stimuli and for realizing their potential for ultra-low power memory and logic devices as well as novel computing architectures. In this work, we employ synchrotron-based near-field infrared nano-spectroscopy to reveal the vibrational properties of ferroelastic (90\documentclass[12pt]{minimal}
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\begin{document}$${}^{\circ }$$\end{document}∘ ferroelectric) domain walls in the hybrid improper ferroelectric Ca\documentclass[12pt]{minimal}
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\begin{document}$${}_{7}$$\end{document}7. By locally mapping the Ti-O stretching and Ti-O-Ti bending modes, we reveal how structural order parameters rotate across a wall. Thus, we link observed near-field amplitude changes to underlying structural modulations and test ferroelectric switching models against real space measurements of local structure. This initiative opens the door to broadband infrared nano-imaging of heterogeneity in ferroics. Ferroic domain walls are nano-objects that are considered functional elements in future devices. Here, the authors study phonons across ferroelastic domain walls by synchrotron-based near-field infrared nano-spectroscopy and relate these changes to the order parameter which helps to understand domain wall dynamics.
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43
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Stanulis A, Katelnikovas A, Salak AN, Seibutas P, Ivanov M, Grigalaitis R, Banys J, Kareiva A, Ramanauskas R, Barron AR. Temperature-Induced Structural Transformations in Undoped and Eu 3+-Doped Ruddlesden-Popper Phases Sr 2SnO 4 and Sr 3Sn 2O 7: Relation to the Impedance and Luminescence Behaviors. Inorg Chem 2019; 58:11410-11419. [PMID: 31429539 DOI: 10.1021/acs.inorgchem.9b00958] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report that luminescence of Eu3+ ion incorporated into Ruddlesden-Popper phases allows monitoring phase transition in powders (instead of single crystals), in a time-efficient manner (compared to neutron diffraction), and importantly, with greater sensitivity than previous methods. Crystal structure and dielectric response of undoped and 0.5%Eu3+-doped Sr3Sn2O7 ceramics were studied as a function of temperature over the temperature range of 300-800 K. The luminescence studies of 0.5%Eu3+-doped Sr2SnO4 and Sr3Sn2O7 samples were performed in the temperature range of 80-500 K. These results were compared with the respective dependences for the undoped compounds. The structural transformations in 0.5%Eu3+-doped Sr3Sn2O7 were found at 390 and 740 K. The former is associated with the isostructural atomic rearrangement that resulted in a negative thermal expansion along two of three orthorhombic crystallographic axes, while the latter corresponds to the structural transition from the orthorhombic Amam phase to the tetragonal I4/mmm one. A similar temperature behavior with the structural transformations in the same temperature ranges was observed in undoped Sr3Sn2O7, although the values of lattice parameters of the Eu3+-doped and undoped compounds were found to be slightly different indicating an incorporation of europium in the crystal lattice. A dielectric anomaly associated with a structural phase transition was observed in Sr3Sn2O7 at 390 K. Optical measurements performed over a wide temperature range demonstrated a clear correlation between structural transformations in Eu3+-doped Sr2SnO4 and Sr3Sn2O7 and the temperature anomalies of their luminescence spectra, suggesting the efficacy of this method for the determination of subtle phase transformations.
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Affiliation(s)
- Andrius Stanulis
- Energy Safety Research Institute , Swansea University , Bay Campus , Swansea SA1 8EN , U.K.,Department of Electrochemical Materials Science , Center for Physical Sciences and Technology , Sauletekio Av. 3 , Vilnius LT-10257 , Lithuania
| | | | - Andrei N Salak
- Department of Materials and Ceramics Engineering, CICECO-Aveiro Institute of Materials , University of Aveiro , Aveiro 3810-193 , Portugal
| | - Povilas Seibutas
- Institute of Applied Electrodynamics and Telecommunications, Faculty of Physics , Vilnius University , Sauletekio Av. 9, III Bld , Vilnius LT-10222 , Lithuania
| | - Maksim Ivanov
- Institute of Applied Electrodynamics and Telecommunications, Faculty of Physics , Vilnius University , Sauletekio Av. 9, III Bld , Vilnius LT-10222 , Lithuania
| | - Robertas Grigalaitis
- Institute of Applied Electrodynamics and Telecommunications, Faculty of Physics , Vilnius University , Sauletekio Av. 9, III Bld , Vilnius LT-10222 , Lithuania
| | - Juras Banys
- Institute of Applied Electrodynamics and Telecommunications, Faculty of Physics , Vilnius University , Sauletekio Av. 9, III Bld , Vilnius LT-10222 , Lithuania
| | | | - Rimantas Ramanauskas
- Department of Electrochemical Materials Science , Center for Physical Sciences and Technology , Sauletekio Av. 3 , Vilnius LT-10257 , Lithuania
| | - Andrew R Barron
- Energy Safety Research Institute , Swansea University , Bay Campus , Swansea SA1 8EN , U.K
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Kang KT, Roh CJ, Lim J, Min T, Lee JH, Lee K, Lee TY, Kang S, Seol D, Kim J, Ohta H, Khare A, Park S, Kim Y, Chae SC, Oh YS, Lee J, Yu J, Lee JS, Choi WS. A Room-Temperature Ferroelectric Ferromagnet in a 1D Tetrahedral Chain Network. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1808104. [PMID: 31034128 DOI: 10.1002/adma.201808104] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2018] [Revised: 04/10/2019] [Indexed: 06/09/2023]
Abstract
Ferroelectricity occurs in crystals with broken spatial inversion symmetry. In conventional perovskite oxides, concerted ionic displacements within a 3D network of transition-metal-oxygen polyhedra (MOx ) manifest spontaneous polarization. Meanwhile, some 2D networks of MOx foster geometric ferroelectricity with magnetism, owing to the distortion of the polyhedra. Because of the fundamentally different mechanism of ferroelectricity in a 2D network, one can further challenge an uncharted mechanism of ferroelectricity in a 1D channel of MOx and estimate its feasibility. Here, ferroelectricity and coupled ferromagnetism in a 1D FeO4 tetrahedral chain network of a brownmillerite SrFeO2.5 epitaxial thin film are presented. The result provides a new paradigm for designing low-dimensional MOx networks, which is expected to benefit the realization of macroscopic ferro-ordering materials including ferroelectric ferromagnets.
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Affiliation(s)
- Kyeong Tae Kang
- Department of Physics, Sungkyunkwan University, Suwon, 16419, Republic of Korea
| | - Chang Jae Roh
- Department of Physics and Photon Science, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea
| | - Jinyoung Lim
- Department of Physics and Astronomy, Center for Theoretical Physics, Seoul National University, Seoul, 08826, Republic of Korea
| | - Taewon Min
- Department of Physics, Pusan National University, Busan, 46241, Republic of Korea
| | - Jun Han Lee
- Department of Physics, Ulsan National Institute of Science and Technology, Ulsan, 44919, Republic of Korea
| | - Kyoungjun Lee
- Department of Physics Education, Seoul National University, Seoul, 08826, Republic of Korea
| | - Tae Yoon Lee
- Department of Physics Education, Seoul National University, Seoul, 08826, Republic of Korea
| | - Seunghun Kang
- School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon, 16419, Republic of Korea
| | - Daehee Seol
- School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon, 16419, Republic of Korea
| | - Jiwoong Kim
- Department of Physics, Pusan National University, Busan, 46241, Republic of Korea
| | - Hiromichi Ohta
- Research Institute for Electronic Science, Hokkaido University, Sapporo, 001-0020, Japan
| | - Amit Khare
- Department of Physics, Sungkyunkwan University, Suwon, 16419, Republic of Korea
| | - Sungkyun Park
- Department of Physics, Pusan National University, Busan, 46241, Republic of Korea
| | - Yunseok Kim
- School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon, 16419, Republic of Korea
| | - Seung Chul Chae
- Department of Physics Education, Seoul National University, Seoul, 08826, Republic of Korea
| | - Yoon Seok Oh
- Department of Physics, Ulsan National Institute of Science and Technology, Ulsan, 44919, Republic of Korea
| | - Jaekwang Lee
- Department of Physics, Pusan National University, Busan, 46241, Republic of Korea
| | - Jaejun Yu
- Department of Physics and Astronomy, Center for Theoretical Physics, Seoul National University, Seoul, 08826, Republic of Korea
| | - Jong Seok Lee
- Department of Physics and Photon Science, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea
| | - Woo Seok Choi
- Department of Physics, Sungkyunkwan University, Suwon, 16419, Republic of Korea
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45
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Guo YY, Gibbs AS, Perez-Mato JM, Lightfoot P. Unexpected phase transition sequence in the ferroelectric Bi 4Ti 3O 12. IUCRJ 2019; 6:438-446. [PMID: 31098024 PMCID: PMC6503926 DOI: 10.1107/s2052252519003804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Accepted: 03/19/2019] [Indexed: 06/09/2023]
Abstract
The high-temperature phase behaviour of the ferroelectric layered perovskite Bi4Ti3O12 has been re-examined by high-resolution powder neutron diffraction. Previous studies, both experimental and theoretical, had suggested conflicting structural models and phase transition sequences, exacerbated by the complex interplay of several competing structural instabilities. This study confirms that Bi4Ti3O12 undergoes two separate structural transitions from the aristotype tetragonal phase (space group I4/mmm) to the ambient-temperature ferroelectric phase (confirmed as monoclinic, B1a1). An unusual, and previously unconsidered, intermediate paraelectric phase is suggested to exist above T C with tetragonal symmetry, space group P4/mbm. This phase is peculiar in displaying a unique type of octahedral tilting, in which the triple perovskite blocks of the layered structure alternate between tilted and untilted. This is rationalized in terms of the bonding requirements of the Bi3+ cations within the perovskite blocks.
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Affiliation(s)
- Yuan-Yuan Guo
- School of Chemistry and EaStCHEM, University of St Andrews, St Andrews KY16 9ST, Scotland
| | - Alexandra S. Gibbs
- ISIS Facility, Rutherford Appleton Laboratory, Harwell Campus, Harwell OX11 0QX, UK
| | - J. Manuel Perez-Mato
- Dept. of Condensed Matter Physics, University of the Basque Country UPV/EHU, Apartado 644, 48080 Bilbao, Spain
| | - Philip Lightfoot
- School of Chemistry and EaStCHEM, University of St Andrews, St Andrews KY16 9ST, Scotland
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46
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Spaldin NA, Ramesh R. Advances in magnetoelectric multiferroics. NATURE MATERIALS 2019; 18:203-212. [PMID: 30783227 DOI: 10.1038/s41563-018-0275-2] [Citation(s) in RCA: 301] [Impact Index Per Article: 60.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Accepted: 12/17/2018] [Indexed: 05/05/2023]
Abstract
The manipulation of magnetic properties by an electric field in magnetoelectric multiferroic materials has driven significant research activity, with the goal of realizing their transformative technological potential. Here, we review progress in the fundamental understanding and design of new multiferroic materials, advances in characterization and modelling tools to describe them, and the exploration of devices and applications. Focusing on the translation of the many scientific breakthroughs into technological innovations, we identify the key open questions in the field where targeted research activities could have maximum impact in transitioning scientific discoveries into real applications.
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Affiliation(s)
- N A Spaldin
- Materials Theory, ETH Zurich, Zürich, Switzerland.
| | - R Ramesh
- Department of Materials Science and Engineering, UC Berkeley, Berkeley, CA, USA
- Department of Physics, UC Berkeley, Berkeley, CA, USA
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
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47
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Beqiri D, Cascos V, Roberts-Watts J, Clark ER, Bousquet E, Bristowe NC, McCabe EE. Tuning octahedral tilts and the polar nature of A-site deficient perovskites. Chem Commun (Camb) 2019; 55:2609-2612. [PMID: 30756099 DOI: 10.1039/c8cc10126d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Herein we highlight the ability to tune the structural chemistry of A-site deficient perovskite materials Ln1/3NbO3. Computational studies explore the balance between proper and hybrid-improper mechanisms for polar behaviour in these systems.
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Affiliation(s)
- Dashnor Beqiri
- School of Physical Sciences, University of Kent, Canterbury, Kent, CT2 7NH, UK
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48
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Dong S, Xiang H, Dagotto E. Magnetoelectricity in multiferroics: a theoretical perspective. Natl Sci Rev 2019; 6:629-641. [PMID: 34691919 PMCID: PMC8291640 DOI: 10.1093/nsr/nwz023] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Revised: 01/31/2019] [Accepted: 02/04/2019] [Indexed: 11/24/2022] Open
Abstract
The key physical property of multiferroic materials is the existence of coupling between magnetism and polarization, i.e. magnetoelectricity. The origin and manifestations of magnetoelectricity can be very different in the available plethora of multiferroic systems, with multiple possible mechanisms hidden behind the phenomena. In this review, we describe the fundamental physics that causes magnetoelectricity from a theoretical viewpoint. The present review will focus on mainstream physical mechanisms in both single-phase multiferroics and magnetoelectric heterostructures. The most recent tendencies addressing possible new magnetoelectric mechanisms will also be briefly outlined.
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Affiliation(s)
- Shuai Dong
- School of Physics, Southeast University, Nanjing 211189, China
| | - Hongjun Xiang
- Key Laboratory of Computational Physical Sciences (Ministry of Education), State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200433, China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China
| | - Elbio Dagotto
- Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, USA
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
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Li C, Gao Z, Tian X, Zhang J, Ju D, Wu Q, Lu W, Sun Y, Cui D, Tao X. Bulk crystal growth and characterization of the bismuth ferrite-based material Bi3FeO4(MoO4)2. CrystEngComm 2019. [DOI: 10.1039/c8ce02137f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The large, high-quality Bi3FeO4(MoO4)2 single crystals of size up to 28 × 20 × 12 mm3 were grown successfully by the TSSG method. The thermal, optical, magnetization, and polarized Raman properties are investigated in detail.
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Affiliation(s)
- Conggang Li
- State Key Laboratory of Crystal Materials & Institute of Crystal Materials
- Shandong University
- Jinan 250100
- P. R. China
| | - Zeliang Gao
- State Key Laboratory of Crystal Materials & Institute of Crystal Materials
- Shandong University
- Jinan 250100
- P. R. China
| | - Xiangxin Tian
- State Key Laboratory of Crystal Materials & Institute of Crystal Materials
- Shandong University
- Jinan 250100
- P. R. China
| | - Junjie Zhang
- State Key Laboratory of Crystal Materials & Institute of Crystal Materials
- Shandong University
- Jinan 250100
- P. R. China
- Materials Science and Technology Division
| | - Dianxing Ju
- State Key Laboratory of Crystal Materials & Institute of Crystal Materials
- Shandong University
- Jinan 250100
- P. R. China
| | - Qian Wu
- State Key Laboratory of Crystal Materials & Institute of Crystal Materials
- Shandong University
- Jinan 250100
- P. R. China
| | - Weiqun Lu
- State Key Laboratory of Crystal Materials & Institute of Crystal Materials
- Shandong University
- Jinan 250100
- P. R. China
| | - Youxuan Sun
- State Key Laboratory of Crystal Materials & Institute of Crystal Materials
- Shandong University
- Jinan 250100
- P. R. China
| | - Deliang Cui
- State Key Laboratory of Crystal Materials & Institute of Crystal Materials
- Shandong University
- Jinan 250100
- P. R. China
| | - Xutang Tao
- State Key Laboratory of Crystal Materials & Institute of Crystal Materials
- Shandong University
- Jinan 250100
- P. R. China
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50
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Li T, Clulow R, Bradford AJ, Lee SL, Slawin AMZ, Lightfoot P. A hybrid fluoride layered perovskite, (enH 2)MnF 4. Dalton Trans 2019; 48:4784-4787. [PMID: 30888371 DOI: 10.1039/c9dt00757a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The title compound is the first example of a layered fluoroperovskite containing an interlayer organic cation. Preliminary magnetic characterisation is reported, and structural relationships to related layered perovskites are discussed.
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Affiliation(s)
- Teng Li
- School of Chemistry and EaStChem, University of St Andrews, St Andrews, Fife, KY16 9ST, UK.
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