1
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Morita S, Urushihara D, Nishibashi K, Kobayashi M, Yamamoto E, Asaka T, Nakajima H, Mori S, Osada M. Atomic Layer Engineering of Ferroelectricity in Dion-Jacobson Perovskites. J Am Chem Soc 2024. [PMID: 39185813 DOI: 10.1021/jacs.4c09214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/27/2024]
Abstract
Recent advances in "hybrid-improper" ferroelectricity in Dion-Jacobson (DJ)-type layered perovskites have caused renewed interest in the search for new ferroelectrics. Here, we present an approach for the tailored synthesis of a new homologous series of DJ-type layered perovskites Cs(Bi2Srn-3)(Tin-1Nb)O3n+1. Starting from CsBi2Ti2NbO10 (n = 3), higher-order homologous phases with n = 4 and 5 were successfully synthesized by repeated solid-state calcination with SrTiO3. Characterizations by X-ray diffraction, electron diffraction, transmission electron microscopy, Raman scattering, and second harmonic generation showed the detailed structural features in Cs(Bi2Srn-3)(Tin-1Nb)O3n+1, and the polar structures could be stabilized by proper or hybrid-improper ferroelectricity, depending on the odd or even number of the perovskite layers. Our results provide important insights into the competition between the different mechanisms and the consequences of the ferroelectric properties in homologous layered perovskites.
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Affiliation(s)
- Shu Morita
- Department of Materials Chemistry & Institute of Materials and Systems for Sustainability (IMaSS), Nagoya University, Nagoya 464-8601, Japan
| | - Daisuke Urushihara
- Division of Advanced Ceramics, Nagoya Institute of Technology, Nagoya 466-8555, Japan
| | - Keita Nishibashi
- Department of Materials Chemistry & Institute of Materials and Systems for Sustainability (IMaSS), Nagoya University, Nagoya 464-8601, Japan
| | - Makoto Kobayashi
- Department of Materials Chemistry & Institute of Materials and Systems for Sustainability (IMaSS), Nagoya University, Nagoya 464-8601, Japan
| | - Eisuke Yamamoto
- Department of Materials Chemistry & Institute of Materials and Systems for Sustainability (IMaSS), Nagoya University, Nagoya 464-8601, Japan
| | - Toru Asaka
- Division of Advanced Ceramics, Nagoya Institute of Technology, Nagoya 466-8555, Japan
| | - Hiroshi Nakajima
- Department of Materials Science, Osaka Metropolitan University, Osaka 599-8531, Japan
| | - Shigeo Mori
- Department of Materials Science, Osaka Metropolitan University, Osaka 599-8531, Japan
| | - Minoru Osada
- Department of Materials Chemistry & Institute of Materials and Systems for Sustainability (IMaSS), Nagoya University, Nagoya 464-8601, Japan
- Research Institute for Quantum and Chemical Innovation, Institutes of Innovation for Future Society, Nagoya University, Nagoya 464-8601, Japan
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2
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Li T, Deng S, Liu H, Chen J. Insights into Strain Engineering: From Ferroelectrics to Related Functional Materials and Beyond. Chem Rev 2024; 124:7045-7105. [PMID: 38754042 DOI: 10.1021/acs.chemrev.3c00767] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/18/2024]
Abstract
Ferroelectrics have become indispensable components in various application fields, including information processing, energy harvesting, and electromechanical conversion, owing to their unique ability to exhibit electrically or mechanically switchable polarization. The distinct polar noncentrosymmetric lattices of ferroelectrics make them highly responsive to specific crystal structures. Even slight changes in the lattice can alter the polarization configuration and response to external fields. In this regard, strain engineering has emerged as a prevalent regulation approach that not only offers a versatile platform for structural and performance optimization within ferroelectrics but also unlocks boundless potential in various functional materials. In this review, we systematically summarize the breakthroughs in ferroelectric-based functional materials achieved through strain engineering and progress in method development. We cover research activities ranging from fundamental attributes to wide-ranging applications and novel functionalities ranging from electromechanical transformation in sensors and actuators to tunable dielectric materials and information technologies, such as transistors and nonvolatile memories. Building upon these achievements, we also explore the endeavors to uncover the unprecedented properties through strain engineering in related chemical functionalities, such as ferromagnetism, multiferroicity, and photoelectricity. Finally, through discussions on the prospects and challenges associated with strain engineering in the materials, this review aims to stimulate the development of new methods for strain regulation and performance boosting in functional materials, transcending the boundaries of ferroelectrics.
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Affiliation(s)
- Tianyu Li
- Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China
- Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Shiqing Deng
- Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Hui Liu
- Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Jun Chen
- Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China
- Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China
- Hainan University, Haikou 570228, China
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3
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Kim J, Yu M, Lee JW, Shang SL, Kim GY, Pal P, Seo J, Campbell N, Eom K, Ramachandran R, Rzchowski MS, Oh SH, Choi SY, Liu ZK, Levy J, Eom CB. Electronic-grade epitaxial (111) KTaO 3 heterostructures. SCIENCE ADVANCES 2024; 10:eadk4288. [PMID: 38787951 PMCID: PMC11122674 DOI: 10.1126/sciadv.adk4288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Accepted: 04/22/2024] [Indexed: 05/26/2024]
Abstract
KTaO3 heterostructures have recently attracted attention as model systems to study the interplay of quantum paraelectricity, spin-orbit coupling, and superconductivity. However, the high and low vapor pressures of potassium and tantalum present processing challenges to creating heterostructure interfaces clean enough to reveal the intrinsic quantum properties. Here, we report superconducting heterostructures based on high-quality epitaxial (111) KTaO3 thin films using an adsorption-controlled hybrid PLD to overcome the vapor pressure mismatch. Electrical and structural characterizations reveal that the higher-quality heterostructure interface between amorphous LaAlO3 and KTaO3 thin films supports a two-dimensional electron gas with substantially higher electron mobility, superconducting transition temperature, and critical current density than that in bulk single-crystal KTaO3-based heterostructures. Our hybrid approach may enable epitaxial growth of other alkali metal-based oxides that lie beyond the capabilities of conventional methods.
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Affiliation(s)
- Jieun Kim
- Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Muqing Yu
- Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, USA
- Pittsburgh Quantum Institute, Pittsburgh, PA 15260, USA
| | - Jung-Woo Lee
- Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Shun-Li Shang
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802, USA
| | - Gi-Yeop Kim
- Department of Materials Science and Engineering, Pohang University of Science and Technology, 77 Cheongam-Ro, Pohang 37673, Republic of Korea
| | - Pratap Pal
- Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Jinsol Seo
- Department of Energy Science, Sungkyunkwan University, Suwon 16419, Korea
- Department of Energy Engineering, KENTECH Institute for Energy Materials and Devices, Korea Institute of Energy Technology (KENTECH), Naju 58330, Republic of Korea
| | - Neil Campbell
- Department of Physics, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Kitae Eom
- Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Ranjani Ramachandran
- Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, USA
- Pittsburgh Quantum Institute, Pittsburgh, PA 15260, USA
| | - Mark S. Rzchowski
- Department of Physics, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Sang Ho Oh
- Department of Energy Science, Sungkyunkwan University, Suwon 16419, Korea
- Department of Energy Engineering, KENTECH Institute for Energy Materials and Devices, Korea Institute of Energy Technology (KENTECH), Naju 58330, Republic of Korea
| | - Si-Young Choi
- Department of Materials Science and Engineering, Pohang University of Science and Technology, 77 Cheongam-Ro, Pohang 37673, Republic of Korea
| | - Zi-Kui Liu
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802, USA
| | - Jeremy Levy
- Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, USA
- Pittsburgh Quantum Institute, Pittsburgh, PA 15260, USA
| | - Chang-Beom Eom
- Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA
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4
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Huo C, Zhang X, Li C, Xu H, Yu P, Cheng L, Zheng C, Gu Z. Robust Tunability and Newly Emerged Q Resonance of Ba 0.8Sr 0.2TiO 3-Based Microwave Capacitors under Gamma Irradiations. ACS APPLIED MATERIALS & INTERFACES 2024. [PMID: 38652647 DOI: 10.1021/acsami.3c19131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/25/2024]
Abstract
The complex resonance of dielectric quality factor Q, combined with a capacitance tunability n higher than 3:1 without any dispersion, was achieved in the voltage-tunable interdigital capacitors (IDCs) based on epitaxial Ba0.8Sr0.2TiO3 ferroelectric thin films across the microwave L (1-2 GHz), S (2-4 GHz), and C (4-8 GHz) bands at room temperature. The resonant Q and n features were driven by the microwave responses of the ferroelectric nanodomains engineered in the films. To promote their application in space radiation environments, the evolutions of Q and n both as functions of frequency f (1-8 GHz) and applied electric field E (0-240 kV/cm) were systematically investigated under a series of gamma-ray irradiations up to 100 kGy. The robust capacitance tunability was accompanied by the emergence of an additional Q resonance at 2.3 GHz in most post-irradiated devices, which is ascribed to extra polar nanoregions of expanded surface lattices associated with oxygen vacancies induced by irradiations.
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Affiliation(s)
- Changhe Huo
- Key Laboratory of Integrated Chips and Systems and School of Microelectronics, Fudan University, Shanghai 200433, P. R. China
| | - Xinyuan Zhang
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, P. R. China
| | - Cong Li
- State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, P. R. China
| | - Hongtao Xu
- Key Laboratory of Integrated Chips and Systems and School of Microelectronics, Fudan University, Shanghai 200433, P. R. China
| | - Pu Yu
- State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, P. R. China
| | - Long Cheng
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, P. R. China
| | - Changlin Zheng
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, P. R. China
| | - Zongquan Gu
- State Key Laboratory of Integrated Chips and Systems and School of Microelectronics, Fudan University, Shanghai 200433, P. R. China
- Institute for Nanoelectronic Devices and Quantum Computing, Fudan University, Shanghai 200433, P. R. China
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5
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Zhou X, Zhao MH, Yao SM, Dong H, Wang Y, Chen B, Xing X, Li MR. Calibration of local chemical pressure by optical probe. Natl Sci Rev 2023; 10:nwad190. [PMID: 37565188 PMCID: PMC10411671 DOI: 10.1093/nsr/nwad190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Revised: 06/15/2023] [Accepted: 06/26/2023] [Indexed: 08/12/2023] Open
Abstract
Chemical stabilization of a high-pressure metastable state is a major challenge for the development of advanced materials. Although chemical pressure (Pchem) can effectively simulate the effect of physical pressure (Pphy), experimental calibration of the pressure passed to local structural motifs, denoted as local chemical pressure (Pchem-Δ) which significantly governs the function of solid materials, remains absent due to the challenge of probing techniques. Here we establish an innovative methodology to experimentally calibrate the Pchem-Δ and build a bridge between Pchem and Pphy via an optical probe strategy. Site-selective Bi3+-traced REVO4 (RE = Y, Gd) is adopted as a prototype to introduce Bi3+ optical probes and on-site sense of the Pchem-Δ experienced by the REO8 motif. The cell compression of RE0.98Bi0.02VO4 under Pphy is chemically simulated by smaller-ion substitution (Sc3+ → RE3+) in RE0.98-xScxBi0.02VO4. The consistent red shift (Δλ) of the emission spectra of Bi3+, which is dominated by locally pressure-induced REO8 dodecahedral variation in RE0.98Bi0.02VO4 (Pphy) and RE0.98-xScxBi0.02VO4 (Pchem-Δ), respectively, is evidence of their similar pressure-dependent local structure evolution. This innovative Δλ-based experimental calibration of Pchem-Δ in the crystal-field dimension portrays the anisotropic transmission of Pchem to the local structure and builds a bridge between Pchem-Δ and Pphy to guide a new perspective for affordable and practical interception of metastable states.
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Affiliation(s)
- Xiao Zhou
- Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China
| | - Mei-Huan Zhao
- Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China
| | - Shan-Ming Yao
- Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China
| | - Hongliang Dong
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
| | - Yonggang Wang
- School of Materials Science and Engineering, Peking University, Beijing 100871, China
| | - Bin Chen
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
| | - Xianran Xing
- Beijing Advanced Innovation Center for Materials Genome Engineering, Institute of Solid State Chemistry, University of Science and Technology Beijing, Beijing 100083, China
| | - Man-Rong Li
- Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China
- School of Science, Hainan University, Haikou 570228, China
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6
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Aso S, Matsuo H, Noguchi Y. Reversible electric-field-induced phase transition in Ca-modified NaNbO 3 perovskites for energy storage applications. Sci Rep 2023; 13:6771. [PMID: 37186239 PMCID: PMC10130038 DOI: 10.1038/s41598-023-33975-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Accepted: 04/21/2023] [Indexed: 05/17/2023] Open
Abstract
Sodium niobate (NaNbO3) is a potential material for lead-free dielectric ceramic capacitors for energy storage applications because of its antipolar ordering. In principle, a reversible phase transition between antiferroelectric (AFE) and ferroelectric (FE) phases can be induced by an application of electric field (E) and provides a large recoverable energy density. However, an irreversible phase transition from the AFE to the FE phase usually takes place and an AFE-derived polarization feature, a double polarization (P)-E hysteresis loop, does not appear. In this study, we investigate the impact of chemically induced hydrostatic pressure (pchem) on the phase stability and polarization characteristics of NaNbO3-based ceramics. We reveal that the cell volume of Ca-modified NaNbO3 [(CaxNa1-2xVx)NbO3], where V is A-site vacancy, decreases with increasing x by a positive pchem. Structural analysis using micro-X-ray diffraction measurements shows that a reversible AFE-FE phase transition leads to a double P-E hysteresis loop for the sample with x = 0.10. DFT calculations support that a positive pchem stabilizes the AFE phase even after the electrical poling and provides the reversible phase transition. Our study demonstrates that an application of positive pchem is effective in delivering the double P-E loop in the NaNbO3 system for energy storage applications.
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Affiliation(s)
- Seiyu Aso
- Department of Computer Science and Electrical Engineering, Graduate School of Science and Technology, Kumamoto University, 2-39-1, Kurokami, Chuo-ku, Kumamoto, 860-8555, Japan
| | - Hiroki Matsuo
- International Research Organization for Advanced Science & Technology (IROAST), Kumamoto University, 2-39-1, Kurokami, Chuo-ku, Kumamoto, 860-8555, Japan.
| | - Yuji Noguchi
- Division of Information and Energy, Faculty of Advanced Science and Technology, Kumamoto University, 2-39-1, Kurokami, Chuo-ku, Kumamoto, 860-8555, Japan.
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7
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MacManus-Driscoll JL, Wu R, Li W. Interface-related phenomena in epitaxial complex oxide ferroics across different thin film platforms: opportunities and challenges. MATERIALS HORIZONS 2023; 10:1060-1086. [PMID: 36815609 PMCID: PMC10068909 DOI: 10.1039/d2mh01527g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Accepted: 02/16/2023] [Indexed: 06/18/2023]
Abstract
Interfaces in complex oxides give rise to fascinating new physical phenomena arising from the interconnected spin, lattice, charge and orbital degrees of freedom. Most commonly, interfaces are engineered in epitaxial superlattice films. Of growing interest also are epitaxial vertically aligned nanocomposite films where interfaces form by self-assembly. These two thin film forms offer different capabilities for materials tuning and have been explored largely separately from one another. Ferroics (ferroelectric, ferromagnetic, multiferroic) are among the most fascinating phenomena to be manipulated using interface effects. Hence, in this review we compare and contrast the ferroic properties that arise in these two different film forms, highlighting exemplary materials combinations which demonstrate novel, enhanced and/or emergent ferroic functionalities. We discuss the origins of the observed functionalities and propose where knowledge can be translated from one materials form to another, to potentially produce new functionalities. Finally, for the two different film forms we present a perspective on underexplored/emerging research directions.
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Affiliation(s)
| | - Rui Wu
- Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, CB3 0FS, UK.
- Spin-X Institute, School of Physics and Optoelectronics, State Key Laboratory of Luminescent Materials and Devices, Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials, South China University of Technology, Guangzhou 511442, China
| | - Weiwei Li
- Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, CB3 0FS, UK.
- MIIT Key Laboratory of Aerospace Information Materials and Physics, State Key Laboratory of Mechanics and Control of Mechanical Structures, College of Physics, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
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8
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Fleck EE, Barone MR, Nair HP, Schreiber NJ, Dawley NM, Schlom DG, Goodge BH, Kourkoutis LF. Atomic-Scale Mapping and Quantification of Local Ruddlesden-Popper Phase Variations. NANO LETTERS 2022; 22:10095-10101. [PMID: 36473700 PMCID: PMC9801418 DOI: 10.1021/acs.nanolett.2c03893] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Revised: 11/16/2022] [Indexed: 06/17/2023]
Abstract
The Ruddlesden-Popper (An+1BnO3n+1) compounds are highly tunable materials whose functional properties can be dramatically impacted by their structural phase n. The negligible differences in formation energies for different n can produce local structural variations arising from small stoichiometric deviations. Here, we present a Python analysis platform to detect, measure, and quantify the presence of different n-phases based on atomic-resolution scanning transmission electron microscopy (STEM) images. We employ image phase analysis to identify horizontal Ruddlesden-Popper faults within the lattice images and quantify the local structure. Our semiautomated technique considers effects of finite projection thickness, limited fields of view, and lateral sampling rates. This method retains real-space distribution of layer variations allowing for spatial mapping of local n-phases to enable quantification of intergrowth occurrence and qualitative description of their distribution suitable for a wide range of layered materials.
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Affiliation(s)
- Erin E. Fleck
- School
of Applied and Engineering Physics, Cornell
University, Ithaca, New York 14853, United States
| | - Matthew R. Barone
- Department
of Materials Science and Engineering, Cornell
University, Ithaca, New York 14853, United States
| | - Hari P. Nair
- Department
of Materials Science and Engineering, Cornell
University, Ithaca, New York 14853, United States
| | - Nathaniel J. Schreiber
- Department
of Materials Science and Engineering, Cornell
University, Ithaca, New York 14853, United States
| | - Natalie M. Dawley
- Department
of Materials Science and Engineering, 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, Cornell University, Ithaca, New York 14853, United States
- Leibniz-Institut
für Kristallzüchtung, Max-Born-Str. 2, 12489 Berlin, Germany
| | - Berit H. Goodge
- School
of Applied and Engineering Physics, Cornell
University, Ithaca, New York 14853, United States
| | - Lena F. Kourkoutis
- School
of Applied and Engineering Physics, Cornell
University, Ithaca, New York 14853, United States
- Kavli
Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, New York 14853, United States
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9
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10
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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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11
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Zhou D, Guo HH, Fu MS, Yao XG, Lin HX, Liu WF, Pang LX, Singh C, Trukhanov S, Trukhanov A, Reaney IM. Anomalous dielectric behaviour during the monoclinic to tetragonal phase transition in La(Nb 0.9V 0.1)O 4. Inorg Chem Front 2021. [DOI: 10.1039/d0qi00981d] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The behaviour of εr in La(Nb0.9V0.1)O4vs. temperature is anomalous and may have novel applications in composite ceramics.
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12
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Zhang J, Ding F, Lee JJ, Shan G, Bobev S. One Structure, Two Elements-LuGe 2 Superconductor vs Ordinary Metallic Conductor LuSn 2. A Case Study on How Site-Selective Germanium for Tin Atom Substitution Leads to Modulating of the Charge Distribution. Inorg Chem 2020; 59:16853-16864. [PMID: 32970413 DOI: 10.1021/acs.inorgchem.0c01062] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The substitution of chemically similar elements in a given crystal structure is an effective way to enhance physical properties, but the understanding on such improvements is usually impeded because the substitutions are random, and the roles of the different atoms cannot be distinguished by crystallographic symmetry. Herein, we provide a detailed crystallographic analysis and property measurements for the continuous solid solutions LuGexSn2-x (0 < x < 2). The results show that there is no apparent change of the global symmetry, with the end-members LuGe2 and LuSn2, as well as the intermediate LuGexSn2-x compositions adopting the ZrSi2 type structure (space group Cmcm, Pearson index oC12). Yet, the refinements of the crystal structures from single-crystal X-ray diffraction data show that Ge-Sn atom substitutions are not random, but occur preferentially at the zigzag chain. The patterned distribution of two group 14 elements leads to a significant variation in chemical bonding and charge ordering within the other structural fragment, the 2D square nets, thereby resulting in tuned electron transport. The enhancement is greater than that for the typical Bloch-Gruneisen model and more akin to that for the parallel-resistor model. Magnetization measurements on single crystals show bulk superconductivity in all LuGexSn2-x samples with shielding fractions as high as 90%. Specific heat data confirm the effect to originate from residual metallic tin in the material, indicating that Sn atom substitutions in the 2D square nets cause disruptions of the hypervalent bonding and local anisotropy, which ultimately leads to vanishing of the superconducting state in the end-member LuGe2. This work sheds light on how the complexity in chemical interactions by two different carbon congeners leads to changes in the physical properties and how they can be correlated with the induced charge distribution. These studies also provide a general approach to modulation of charge density and. thus, of emerging physical properties in other classes of intermetallic systems based on the main-group elements of groups 13 to 15.
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Affiliation(s)
- Jiliang Zhang
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States.,Department of Materials Science and Engineering, Korea University, Seoul 02841, Republic of Korea
| | - Fazhu Ding
- Key Laboratory of Applied Superconductivity and Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.,University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Jey-Jau Lee
- National Synchrotron Radiation Research Center, Hsinchu 30076 Taiwan, Republic of China
| | - Guangcun Shan
- School of Instrument Science and Optoelectronics Engineering & Institute of Precision Mechanics and Quantum Sensing, Beihang University, Beijing 100083, People's Republic of China.,Institute of Experimental Physics, Saarland University, 66123 Saarbrücken, Germany
| | - Svilen Bobev
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
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