1
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Al Bacha S, Saitzek S, Kabbour H, McCabe EE. Iron Oxychalcogenides and Their Photocurrent Responses. Inorg Chem 2024; 63:3292-3302. [PMID: 38306605 PMCID: PMC10880050 DOI: 10.1021/acs.inorgchem.3c03672] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Revised: 12/27/2023] [Accepted: 01/15/2024] [Indexed: 02/04/2024]
Abstract
We report here the results of an experimental investigation of the electronic properties and photocurrent responses of the CaFeOQ and La2O2Fe2OQ2 phases and a computational study of the electronic structure of polar CaFeOSe. We find that both CaFeOQ (Q = S and Se) have band gaps and conduction band edge positions compatible with light-driven photocatalytic water splitting, although the oxysulfide suffers from degradation due to the oxidation of Fe2+ sites. The higher O/Q ratio in the Fe2+ coordination environment in CaFeOSe increases its stability without increasing the band gap beyond the visible range. The photocurrent CaFeOSe shows fast electron-hole separation, consistent with calculated carrier effective masses. These results suggest that these iron oxychalcogenides warrant further study to optimize their stability and morphology for photocatalytic and other photoactive applications.
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Affiliation(s)
- Sandy Al Bacha
- Univ.
Lille, CNRS, Centrale Lille, ENSCL, Univ. Artois, UMR 8181–UCCS–Unité
de Catalyse et Chimie du Solide, F-59000 Lille, France
- University
of Kent, School of Physical Sciences, Canterbury, Kent CT2 7NH, U.K.
- Department
of Physics, Durham University, Durham DH1 3LE, U.K.
| | - Sébastien Saitzek
- Univ.
Artois, CNRS, Centrale Lille, Univ. Lille, UMR 8181, Unité
de Catalyse et Chimie du Solide (UCCS), F-62300 Lens, France
| | - Houria Kabbour
- Univ.
Lille, CNRS, Centrale Lille, ENSCL, Univ. Artois, UMR 8181–UCCS–Unité
de Catalyse et Chimie du Solide, F-59000 Lille, France
| | - Emma E. McCabe
- Department
of Physics, Durham University, Durham DH1 3LE, U.K.
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2
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Zhang Y, Wu H, Hu Z, Yu H. Oxychalcogenides: A Promising Class of Materials for Nonlinear Optical Crystals with Mixed-Anion Groups. Chemistry 2023; 29:e202203597. [PMID: 36524850 DOI: 10.1002/chem.202203597] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Revised: 12/16/2022] [Accepted: 12/16/2022] [Indexed: 12/23/2022]
Abstract
Infrared nonlinear optical (IR NLO) materials are of great significance in the development of IR laser technology. But rationally designing high-performance IR NLO materials remains a huge challenge due to the conflict between the necessary properties required for NLO materials. Notably, oxychalcogenides with mixed-anion groups have drawn extensive interest as a family of important IR NLO candidates because they integrate the property advantages of oxides and chalcogenides by chemical substitution engineering. In this review, we provide a survey of reported oxychalcogenides and aim to present the development of NLO oxychalcogenides from the perspective of rational design of their structural chemistry. Furthermore, we focus on the relationships between partial substitution and structural symmetry as well as optical properties. These provide some helpful guidance for the further exploration and design of novel oxychalcogenide materials with excellent NLO performance in the future.
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Affiliation(s)
- Yujie Zhang
- Tianjin Key Laboratory of Functional Crystal Materials Institute of Functional Crystal College of Materials Science and Engineering, Tianjin University of Technology, Tianjin, 300384, P. R. China
| | - Hongping Wu
- Tianjin Key Laboratory of Functional Crystal Materials Institute of Functional Crystal College of Materials Science and Engineering, Tianjin University of Technology, Tianjin, 300384, P. R. China
| | - Zhanggui Hu
- Tianjin Key Laboratory of Functional Crystal Materials Institute of Functional Crystal College of Materials Science and Engineering, Tianjin University of Technology, Tianjin, 300384, P. R. China
| | - Hongwei Yu
- Tianjin Key Laboratory of Functional Crystal Materials Institute of Functional Crystal College of Materials Science and Engineering, Tianjin University of Technology, Tianjin, 300384, P. R. China
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3
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Orr M, Hebberd GR, McCabe EE, Macaluso RT. Structural Diversity of Rare-Earth Oxychalcogenides. ACS OMEGA 2022; 7:8209-8218. [PMID: 35309485 PMCID: PMC8928505 DOI: 10.1021/acsomega.2c00186] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Accepted: 02/21/2022] [Indexed: 06/14/2023]
Abstract
Mixed-anion systems have garnered much attention in the past decade with attractive properties for diverse applications such as energy conversion, electronics, and catalysis. The discovery of new materials through mixed-cation and single-anion systems proved highly successful in the previous century, but solid-state chemists are now embracing an exciting design opportunity by incorporating multiple anions in compounds such as oxychalcogenides. Materials containing rare-earth ions are arguably a cornerstone of modern technology, and herein, we review recent advances in rare-earth oxychalcogenides. We discuss ternary rare-earth oxychalcogenides whose layered structures illustrate the characters and bonding preferences of oxide and chalcogenide anions. We then review quaternary compounds which combine anionic and cationic design strategies toward materials discovery and describe their structural diversity. Finally, we emphasize the progression from layered two-dimensional compounds to three-dimensional networks and the unique synthetic approaches which enable this advancement.
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Affiliation(s)
- Melissa Orr
- Department
of Chemistry and Biochemistry, University
of Texas at Arlington, Arlington, Texas 76019, United States
| | - Glen R. Hebberd
- Department
of Physics, Durham University, Lower Mountjoy, South Road, Durham DH1 3LE, United Kingdom
| | - Emma E. McCabe
- Department
of Physics, Durham University, Lower Mountjoy, South Road, Durham DH1 3LE, United Kingdom
| | - Robin T. Macaluso
- Department
of Chemistry and Biochemistry, University
of Texas at Arlington, Arlington, Texas 76019, United States
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4
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Almoussawi B, Arevalo-Lopez AM, Simon P, Kabbour H. A high dimensional oxysulfide built from large iron-based clusters with partial charge-ordering. Chem Commun (Camb) 2021; 57:11859-11862. [PMID: 34704560 DOI: 10.1039/d1cc04501f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein we report the original Ba10Fe7.75Zn5.25S18Si3O12 oxysulfide which crystallizes in a new structural type. Contrary to the usual oxychalcogenides, it crystallizes with a non-centrosymmetric 3D spatial network structure built from large magnetic clusters consisting of twelve (Fe2+/3+/Zn)S3O tetrahedra decorating a central Fe2+S6 octahedron and exhibiting a spin glass state.
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Affiliation(s)
- Batoul Almoussawi
- Univ. Lille, CNRS, Centrale Lille, ENSCL, Univ. Artois, UMR 8181 - UCCS - Unité de Catalyse et Chimie du Solide, Lille F-59000, France.
| | - Angel M Arevalo-Lopez
- Univ. Lille, CNRS, Centrale Lille, ENSCL, Univ. Artois, UMR 8181 - UCCS - Unité de Catalyse et Chimie du Solide, Lille F-59000, France.
| | - Pardis Simon
- Univ. Lille, CNRS, Centrale Lille, ENSCL, Univ. Artois, UMR 8181 - UCCS - Unité de Catalyse et Chimie du Solide, Lille F-59000, France.
| | - Houria Kabbour
- Univ. Lille, CNRS, Centrale Lille, ENSCL, Univ. Artois, UMR 8181 - UCCS - Unité de Catalyse et Chimie du Solide, Lille F-59000, France.
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5
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Lin WC, Ryu H, Yang CI, Weng CY, Jang JI, Hsu KF. Perovskite-like Framework Encapsulated with Fe-Based Magnetic Units in Ba10Fe3Sb7Se24. Inorg Chem 2020; 59:5509-5517. [DOI: 10.1021/acs.inorgchem.0c00113] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Wei-Cheng Lin
- Department of Chemistry, National Cheng Kung University, No. 1 University Road, Tainan 70101, Taiwan
| | - Hongsun Ryu
- Department of Physics, Sogang University, 35 Baekbeom-ro, Mapo-gu, Seoul 04107 South Korea
| | - Chen-I Yang
- Department of Chemistry, Tunghai University, Taichung 40704, Taiwan
| | - Chien-Yen Weng
- Department of Chemistry, National Cheng Kung University, No. 1 University Road, Tainan 70101, Taiwan
| | - Joon Ik Jang
- Department of Physics, Sogang University, 35 Baekbeom-ro, Mapo-gu, Seoul 04107 South Korea
| | - Kuei-Fang Hsu
- Department of Chemistry, National Cheng Kung University, No. 1 University Road, Tainan 70101, Taiwan
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6
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Larquet C, Carenco S. Metal Oxysulfides: From Bulk Compounds to Nanomaterials. Front Chem 2020; 8:179. [PMID: 32296676 PMCID: PMC7136583 DOI: 10.3389/fchem.2020.00179] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Accepted: 02/26/2020] [Indexed: 11/30/2022] Open
Abstract
This review summarizes the syntheses and applications of metal oxysulfides. Bulk compounds of rare earth and transition metals are discussed in the section Introduction. After a presentation of their main properties and applications, their structures are presented and their syntheses are discussed. The section Bulk Materials and Their Main Applications is dedicated to the growing field of nanoscaled metal oxysulfides. Synthesis and applications of lanthanide-based nanoparticles are more mature and are discussed first. Then, works on transition-metal based nanoparticles are presented and discussed. Altogether, this review highlights the opportunities offered by metal oxysulfides for application in a range of technological fields, in relation with the most advanced synthetic routes and characterization techniques.
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Affiliation(s)
- Clément Larquet
- Sorbonne Université, CNRS, Collège de France, Laboratoire de Chimie de la Matière Condensée de Paris, LCMCP, Paris, France
- Sorbonne Université, CNRS, IRD, MNHN, Institut de Minéralogie, de Physique des Matériaux et de Cosmologie, IMPMC, Paris, France
| | - Sophie Carenco
- Sorbonne Université, CNRS, Collège de France, Laboratoire de Chimie de la Matière Condensée de Paris, LCMCP, Paris, France
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7
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Valldor M, Galle L, Eichler F, Wolf A, Morrow R. Synthesis, Crystal Structure, and Optical Characterization of the Sulfide Chloride Oxide CsBa 6V 4S 12ClO 4 with a Near-Infrared Fluorescence. Inorg Chem 2019; 58:14728-14733. [PMID: 31618005 DOI: 10.1021/acs.inorgchem.9b02393] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
When CsCl, BaS, BaO, V, and S are reacted in a solid-state reaction under inert conditions, pure powders and single crystals of senary CsBa6V4S12ClO4 can be obtained. Its unique crystal structure has the symmetry R3̅H (no. 148) and unit cell parameters a = 9.0575(2) and c = 28.339(1) Å. The crystal structure contains polar units [VS3O]3- and a complex BaS7ClO2 coordination. The compound gets its deep-red color from a low-energy charge transfer, which can be explained by an electron transfer from S2- to V5+. In the near-infrared range, down-converted fluorescence occurs at 1.06 and 0.90 eV, and both emissions appear <450 ps after excitation at about 1.27 eV.
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Affiliation(s)
- Martin Valldor
- Leibniz Institute for Materials and Solid State Research IFW e.V. , Helmholtzstraße 20 , DE-01069 Dresden , Germany.,Centre for Materials Science and Nanotechnology (SMN), Department of Chemistry , University of Oslo , P.O. Box 1033 Blindern, N-0315 Oslo , Norway
| | - Lydia Galle
- Inorganic Chemistry , TU-Dresden , Bergstraße 66 , DE-01069 Dresden , Germany
| | - Franziska Eichler
- Physical Chemistry , TU-Dresden , Bergstraße 66b , DE-01069 Dresden , Germany
| | - André Wolf
- Physical Chemistry , TU-Dresden , Bergstraße 66b , DE-01069 Dresden , Germany
| | - Ryan Morrow
- Leibniz Institute for Materials and Solid State Research IFW e.V. , Helmholtzstraße 20 , DE-01069 Dresden , Germany
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8
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Zhang X, Xiao Y, Wang R, He J, Wang D, Bu K, Mu G, Huang F. Synthesis, Crystal Structure, and Physical Properties of Layered LnCrSe 2O ( Ln = Ce-Nd). Inorg Chem 2019; 58:9482-9489. [PMID: 31241920 DOI: 10.1021/acs.inorgchem.9b01364] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The layered oxyselenides with the formula LnCrSe2O (Ln = Ce-Nd) were synthesized via molten salt methods. The isostructural compounds crystallize in the monoclinic space group of C2/m. The crystal structures feature ∞2[CrSe2O]3- motifs stacked along the a axis, which are separated by Ln3+ ions. The ∞2[CrSe2O]3- layers are composed of [Cr1Se6]9- and [Cr2Se4O2]9- octahedra via corner and edge sharing. Powder X-ray diffraction results confirm the phase purities of the as-synthesized compounds. LnCrSe2O (Ln = Ce-Nd) show typical antiferromagnetic ordering with TN = 125, 120, and 118 K, respectively. Heat capacity measurement for NdCrSe2O indicates that the Debye temperature is 278.4 K. Similar metal-to-semiconductor phase transitions were observed for LnCrSe2O (Ln = Ce-Nd) plates with transition temperatures of 115, 109, and 95 K, respectively. NdCrSe2O also possesses a magnetoresistance effect at low temperature (<25 K) with a significant positive magnetoresistance ∼ 16% at 2 K and 1 T.
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Affiliation(s)
- Xian Zhang
- Qian Xuesen Laboratory of Space Technology , China Academy of Space Technology , Beijing 100094 , P. R. China
| | - Yi Xiao
- State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , P. R. China
| | - Ruiqi Wang
- State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , P. R. China
| | - Jianqiao He
- CAS Key Laboratory of Materials for Energy Conversion and State Key Laboratory of High Performance Ceramics and Superfine Microstructure , Shanghai Institute of Ceramics, Chinese Academy of Sciences , Shanghai 200050 , P. R. China
| | - Dong Wang
- CAS Key Laboratory of Materials for Energy Conversion and State Key Laboratory of High Performance Ceramics and Superfine Microstructure , Shanghai Institute of Ceramics, Chinese Academy of Sciences , Shanghai 200050 , P. R. China
| | - Kejun Bu
- CAS Key Laboratory of Materials for Energy Conversion and State Key Laboratory of High Performance Ceramics and Superfine Microstructure , Shanghai Institute of Ceramics, Chinese Academy of Sciences , Shanghai 200050 , P. R. China
| | - Gang Mu
- State Key Laboratory of Functional Materials for Informatics , Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences , Shanghai , P. R. China
| | - Fuqiang Huang
- State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , P. R. China.,CAS Key Laboratory of Materials for Energy Conversion and State Key Laboratory of High Performance Ceramics and Superfine Microstructure , Shanghai Institute of Ceramics, Chinese Academy of Sciences , Shanghai 200050 , P. R. China
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9
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Cassidy SJ, Orlandi F, Manuel P, Hadermann J, Scrimshire A, Bingham PA, Clarke SJ. Complex Magnetic Ordering in the Oxide Selenide Sr 2Fe 3Se 2O 3. Inorg Chem 2018; 57:10312-10322. [PMID: 30062877 DOI: 10.1021/acs.inorgchem.8b01542] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Sr2Fe3Se2O3 is a localized-moment iron oxide selenide in which two unusual coordinations for Fe2+ ions form two sublattices in a 2:1 ratio. In the paramagnetic region at room temperature, the compound adopts the crystal structure first reported for Sr2Co3S2O3, crystallizing in space group Pbam with a = 7.8121 Å, b = 10.2375 Å, c = 3.9939 Å, and Z = 2. The sublattice occupied by two-thirds of the iron ions (Fe2 site) is formed by a network of distorted mer-[FeSe3O3] octahedra linked via shared Se2 edges and O vertices forming layers, which connect to other layers by shared Se vertices. As shown by magnetometry, neutron powder diffraction, and Mössbauer spectroscopy measurements, these moments undergo long-range magnetic ordering below TN1 = 118 K, initially adopting a magnetic structure with a propagation vector (1/2 - δ, 0, 1/2) (0 ≤ δ ≤ 0.1) which is incommensurate with the nuclear structure and described in the Pbam1 '( a01/2)000 s magnetic superspace group, until at 92 K ( TINC) there is a first order lock-in transition to a structure in which these Fe2 moments form a magnetic structure with a propagation vector (1/2, 0, 1/2) which may be modeled using a 2 a × b × 2 c expansion of the nuclear cell in space group 36.178 B a b21 m (BNS notation). Below TN2 = 52 K the remaining third of the Fe2+ moments (Fe1 site) which are in a compressed trans-[FeSe4O2] octahedral environment undergo long-range ordering, as is evident from the magnetometry, the Mössbauer spectra, and the appearance of new magnetic Bragg peaks in the neutron diffractograms. The ordering of the second set of moments on the Fe1 sites results in a slight reorientation of the majority moments on the Fe2 sites. The magnetic structure at 1.5 K is described by a 2 a × 2 b × 2 c expansion of the nuclear cell in space group 9.40 I a b (BNS notation).
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Affiliation(s)
- Simon J Cassidy
- Department of Chemistry , University of Oxford, Inorganic Chemistry Laboratory , South Parks Road , Oxford OX1 3QR , United Kingdom
| | - Fabio Orlandi
- ISIS Facility, STFC Rutherford Appleton Laboratory , Harwell Oxford , Didcot OX11 0QX , United Kingdom
| | - Pascal Manuel
- ISIS Facility, STFC Rutherford Appleton Laboratory , Harwell Oxford , Didcot OX11 0QX , United Kingdom
| | - Joke Hadermann
- Electron Microscopy for Materials Science (EMAT) , University of Antwerp , Groenenborgerlaan 171 , B-2020 Antwerp , Belgium
| | - Alex Scrimshire
- Materials and Engineering Research Institute, Faculty of Arts, Computing, Engineering and Sciences , Sheffield Hallam University, City Campus , Howard Street , Sheffield S1 1WB , United Kingdom
| | - Paul A Bingham
- Materials and Engineering Research Institute, Faculty of Arts, Computing, Engineering and Sciences , Sheffield Hallam University, City Campus , Howard Street , Sheffield S1 1WB , United Kingdom
| | - Simon J Clarke
- Department of Chemistry , University of Oxford, Inorganic Chemistry Laboratory , South Parks Road , Oxford OX1 3QR , United Kingdom
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10
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Corkett AJ, Konze PM, Dronskowski R. The Ternary Post-transition Metal Carbodiimide SrZn(NCN)2. Z Anorg Allg Chem 2017. [DOI: 10.1002/zaac.201700225] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Alex J. Corkett
- Institute of Inorganic Chemistry; RWTH Aachen University; 52056 Aachen Germany
| | - Philipp M. Konze
- Institute of Inorganic Chemistry; RWTH Aachen University; 52056 Aachen Germany
| | - Richard Dronskowski
- Institute of Inorganic Chemistry; RWTH Aachen University; 52056 Aachen Germany
- Jülich-Aachen Research Alliance (JARA-HPC); RWTH-Aachen University; 52074 Aachen Germany
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11
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Spin-polarized Second Harmonic Generation from the Antiferromagnetic CaCoSO Single Crystal. Sci Rep 2017; 7:46415. [PMID: 28406164 PMCID: PMC5390297 DOI: 10.1038/srep46415] [Citation(s) in RCA: 117] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Accepted: 03/17/2017] [Indexed: 02/07/2023] Open
Abstract
The spin-polarized second harmonic generation (SHG) of the recently synthesized CaCoSO single crystal is performed based on the calculated electronic band structure. The calculation reveals that the spin-up (↑) channel of CaCoSO possesses a direct energy gap (Γv-Γc) of about 2.187 eV, 1.187 eV (Kv-Kc) for the spin-down (↓) channel and an indirect gap (Γv-Kc) of about 0.4 eV for the spin-polarized CaCoSO single crystal. The linear optical properties obtained reveal that the recently synthesized crystal exhibits considerable anisotropy with negative uniaxial anisotropy and birefringence favor to enhance the SHG. We have calculated the three non-zero tensor components of the SHG and found the is the dominat component, one with a large SHG of about (d33 = 6.936 pm/V at λ = 1064 nm), the half value of KTiOPO4 (KTP). As the values of (↑) < (↓) < spin-polarized are related to the values of the energy gap of (↑) 2.187 eV> (↓) 1.187 eV> spin-polarized gap 0.4 eV; therefore, a smaller energy gap gives better SHG performance. Furthermore, the microscopic first hyperpolarizability, βijk, is calculated.
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12
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Rai HM, Singh P, Saxena SK, Mishra V, Warshi MK, Kumar R, Rajput P, Sagdeo A, Choudhuri I, Pathak B, Sagdeo PR. Room-Temperature Magneto-dielectric Effect in LaGa 0.7Fe 0.3O 3+γ; Origin and Impact of Excess Oxygen. Inorg Chem 2017; 56:3809-3819. [PMID: 28306265 DOI: 10.1021/acs.inorgchem.6b02507] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report an observation of room-temperature magneto-dielectric (RTMD) effect in LaGa0.7Fe0.3O3+γ compound. The contribution of intrinsic/resistive sources in the presently observed RTMD effect was analyzed by measuring direct-current (dc) magnetoresistance (MR) in four-probe geometry and frequency-dependent MR via impedance spectroscopy (MRIS). Present MRIS analysis reveals that at frequencies corresponding to grain contribution (≥1 × 106 Hz for present sample), the observed MD phenomenon is MR-free/intrinsic, whereas at lower probing frequencies (<1 × 106 Hz), the observed MD coupling appears to be MR-dominated possibly due to oxygen excess, that is, due to coexistence of Fe3+ and Fe4+. The magnetostriction is anticipated as a mechanism responsible for MR-free/intrinsic MD coupling, whereas the MR-dominated part is attributed to hopping charge transport along with Maxwell-Wagner and space charge polarization. The multivalence of Fe ions in LaGa0.7Fe0.3O3+γ was validated through iodometric titration and Fe K-edge X-ray absorption near-edge structure measurements. The excess of oxygen, that is, coexistence of Fe3+ and Fe4+, was understood in terms of stability of Fe4+ by means of "bond-valence-sum" analysis and density functional theory-based first-principles calculations. The cation vacancies at La/Ga site (or at La and Ga both) were proposed as the possible origin of excess oxygen in presently studied compound. Present investigation suggests that, to justify the intrinsic/resistive origin of MD phenomenon, frequency-dependent MR measurements are more useful than measuring only dc MR or comparing the trends of magnetic-field-dependent change in dielectric constant and tan δ. Presently studied Fe-doped LaGaO3 can be a candidate for RTMD applications.
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Affiliation(s)
| | | | | | | | | | | | - Parasmani Rajput
- Atomic & Molecular Physics Division, Bhabha Atomic research Centre , Mumbai 400085, India
| | - Archna Sagdeo
- Raja Ramanna Center for Advance Technology , Indore, M.P. 452013, India
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13
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Cassidy SJ, Batuk M, Batuk D, Hadermann J, Woodruff DN, Thompson AL, Clarke SJ. Complex Microstructure and Magnetism in Polymorphic CaFeSeO. Inorg Chem 2016; 55:10714-10726. [PMID: 27704801 DOI: 10.1021/acs.inorgchem.6b01951] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The structural complexity of the antiferromagnetic oxide selenide CaFeSeO is described. The compound contains puckered FeSeO layers composed of FeSe2O2 tetrahedra sharing all their vertexes. Two polymorphs coexist that can be derived from an archetype BaZnSO structure by cooperative tilting of the FeSe2O2 tetrahedra. The polymorphs differ in the relative arrangement of the puckered layers of vertex-linked FeSe2O2 tetrahedra. In a noncentrosymmetric Cmc21 polymorph (a = 3.89684(2) Å, b = 13.22054(8) Å, c = 5.93625(2) Å) the layers are related by the C-centering translation, while in a centrosymmetric Pmcn polymorph, with a similar cell metric (a = 3.89557(6) Å, b = 13.2237(6) Å, c = 5.9363(3) Å), the layers are related by inversion. The compound shows long-range antiferromagnetic order below a Neél temperature of 159(1) K with both polymorphs showing antiferromagnetic coupling via Fe-O-Fe linkages and ferromagnetic coupling via Fe-Se-Fe linkages within the FeSeO layers. The magnetic susceptibility also shows evidence for weak ferromagnetism which is modeled in the refinements of the magnetic structure as arising from an uncompensated spin canting in the noncentrosymmetric polymorph. There is also a spin glass component to the magnetism which likely arises from the disordered regions of the structure evident in the transmission electron microscopy.
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Affiliation(s)
- Simon J Cassidy
- Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford , South Parks Road, Oxford OX1 3QR, United Kingdom.,Diamond Light Source Limited, Harwell Science and Innovation Campus, Didcot OX11 0DE, United Kingdom
| | - Maria Batuk
- Electron Microscopy for Materials Science (EMAT), University of Antwerp , Groenenborgerlaan 171, B-2020 Antwerp, Belgium
| | - Dmitry Batuk
- Electron Microscopy for Materials Science (EMAT), University of Antwerp , Groenenborgerlaan 171, B-2020 Antwerp, Belgium
| | - Joke Hadermann
- Electron Microscopy for Materials Science (EMAT), University of Antwerp , Groenenborgerlaan 171, B-2020 Antwerp, Belgium
| | - Daniel N Woodruff
- Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford , South Parks Road, Oxford OX1 3QR, United Kingdom
| | - Amber L Thompson
- Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford , South Parks Road, Oxford OX1 3QR, United Kingdom
| | - Simon J Clarke
- Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford , South Parks Road, Oxford OX1 3QR, United Kingdom
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14
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Salter EJT, Blandy JN, Clarke SJ. Crystal and Magnetic Structures of the Oxide Sulfides CaCoSO and BaCoSO. Inorg Chem 2016; 55:1697-701. [DOI: 10.1021/acs.inorgchem.5b02615] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Edward J. T. Salter
- Department of Chemistry, Inorganic Chemistry
Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QR, U.K
| | - Jack N. Blandy
- Department of Chemistry, Inorganic Chemistry
Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QR, U.K
- Diamond Light Source Ltd., Harwell Science and Innovation Campus, , Didcot, OX11 0DE, U.K
| | - Simon J. Clarke
- Department of Chemistry, Inorganic Chemistry
Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QR, U.K
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