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Wei XK, Xu K, Vaideeswaran K, Mayer J, Huang H. Observation of Atomic-Scale Polar Vortex-Antivortex Pairs in Antiferroelectric PbZrO 3 Thin Films. NANO LETTERS 2025; 25:8655-8662. [PMID: 40380942 DOI: 10.1021/acs.nanolett.5c01506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2025]
Abstract
Topological polar structures, in analogy to spin vortices and skyrmions, have received tremendous attention for their fascinating prospects in future device applications. However, in the widely studied ferroelectric-based superlattices, the epitaxial heterointerfaces, yielding desired strain, depolarization, and gradient energies, greatly confine the mobility of the topological solitons. Here, we report observation of polar vortex-antivortex pairs near junctions of antiphase boundaries in antiferroelectric PbZrO3 thin films by using atomic-resolution scanning transmission electron microscopy. Our temporal-resolved lattice analysis reveals that the local strain gradient caused by an incommensurate modulation constructs the smallest topological units reported to date. Our phase-field simulations unveil that the Pb-O vacancy-induced random electric fields account for their three-dimensional formation, and the stimulus of electron-beam irradiation can drive their dynamic migration. The findings offer a new approach to comprehend fundamental physics about antiferroelectricity and the design of functional devices based on topological structures in antiferroelectric thin films.
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Affiliation(s)
- Xian-Kui Wei
- College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, China
- Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen, Fujian 361005, China
- Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich GmbH, Jülich, NRW 52425, Germany
| | - Ke Xu
- Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing, 100080, China
| | - Kaushik Vaideeswaran
- Institute of Materials, Swiss Federal Institute of Technology Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Joachim Mayer
- Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich GmbH, Jülich, NRW 52425, Germany
- Central Facility for Electron Microscopy, RWTH Aachen University, Ahornstraße 55, Aachen, NRW 52074, Germany
| | - Houbing Huang
- Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing, 100080, China
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2
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Tucker T, Yang Z, Bugallo D, Dutta R, Laxmeesha PM, Marrero-Hernández GA, May SJ. Substrate-Dependent Optical Blue-Shift upon F Incorporation in Oxyfluoride SrCo(O,F) 3-x Films. Inorg Chem 2025; 64:4483-4490. [PMID: 40013451 PMCID: PMC11898045 DOI: 10.1021/acs.inorgchem.4c05324] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2024] [Revised: 01/28/2025] [Accepted: 02/18/2025] [Indexed: 02/28/2025]
Abstract
Heteroanionic oxides are attractive for their structural versatility and property tunability. In this work, we report on optoelectronic properties in epitaxial oxyfluoride SrCo(O,F)3-x films synthesized on multiple (001)-oriented perovskite substrates. Topochemical fluorination was conducted on the as-grown SrCoO2.5 films at 200 °C using vapor from poly(vinylidene fluoride) (PVDF) as the fluoride source, producing films with a nominal SrCoO2.2F0.6 composition. Uniform fluoride insertion in each film was confirmed via depth-dependent elemental analysis, performed with X-ray photoelectron spectroscopy (XPS). Fluoride incorporation results in an expansion of the c-axis parameter, an increase in resistivity, and a blue-shift of the optical absorption edge by 0.18-0.5 eV. The magnitude of the band gap increase is strongly dependent on the in-plane lattice parameter of the substrate with larger blue-shifts observed in films grown on substrates with smaller lattice parameters, a trend that mirrors the larger resistivity enhancements present in the compressively strained oxyfluoride films. These results are attributed to the interplay between epitaxial strain and fluoride lattice site occupation, suggesting strain-dependent control of anionic arrangements is a promising route for engineering optoelectronic properties in heteroanionic films.
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Affiliation(s)
- Tessa
D. Tucker
- Department
of Materials Science and Engineering, Drexel
University, Philadelphia, Pennsylvania 19104, United States
| | - Zongmin Yang
- Department
of Materials Science and Engineering, Drexel
University, Philadelphia, Pennsylvania 19104, United States
| | - David Bugallo
- Department
of Materials Science and Engineering, Drexel
University, Philadelphia, Pennsylvania 19104, United States
| | - Rajesh Dutta
- Department
of Materials Science and Engineering, Drexel
University, Philadelphia, Pennsylvania 19104, United States
| | - Prajwal M. Laxmeesha
- Department
of Materials Science and Engineering, Drexel
University, Philadelphia, Pennsylvania 19104, United States
| | - Gabriela A. Marrero-Hernández
- Department
of Materials Science and Engineering, Drexel
University, Philadelphia, Pennsylvania 19104, United States
- Department
of Chemistry, University of Puerto Rico
at Cayey, Cayey, Puerto Rico 00736, United States
| | - Steven J. May
- Department
of Materials Science and Engineering, Drexel
University, Philadelphia, Pennsylvania 19104, United States
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3
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Wang T, Gong F, Ma X, Pan S, Wei XK, Kuo C, Yoshida S, Ku YC, Wang S, Yang Z, Hazra S, Zhang KHL, Liu X, Tang Y, Zhu YL, Chang CF, Das S, Ma X, Chen L, Xu B, Gopalan V, Bellaiche L, Martin LW, Chen Z. Large enhancement of ferroelectric properties of perovskite oxides via nitrogen incorporation. SCIENCE ADVANCES 2025; 11:eads8830. [PMID: 39792673 PMCID: PMC11721576 DOI: 10.1126/sciadv.ads8830] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2024] [Accepted: 12/05/2024] [Indexed: 01/12/2025]
Abstract
Perovskite oxides have a wide variety of physical properties that make them promising candidates for versatile technological applications including nonvolatile memory and logic devices. Chemical tuning of those properties has been achieved, to the greatest extent, by cation-site substitution, while anion substitution is much less explored due to the difficulty in synthesizing high-quality, mixed-anion compounds. Here, nitrogen-incorporated BaTiO3 thin films have been synthesized by reactive pulsed-laser deposition in a nitrogen growth atmosphere. The enhanced hybridization between titanium and nitrogen induces a large ferroelectric polarization of 70 μC/cm2 and high Curie temperature of ~1213 K, which are ~2.8 times larger and ~810 K higher than in bulk BaTiO3, respectively. These results suggest great potential for anion-substituted perovskite oxides in producing emergent functionalities and device applications.
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Affiliation(s)
- Tao Wang
- State Key Laboratory of Advanced Welding and Joining of Materials and Structures, School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen 518055, China
| | - Fenghui Gong
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
| | - Xue Ma
- Jiangsu Key Laboratory of Frontier Material Physics and Devices, School of Physical Science and Technology, Soochow University, Suzhou 215006, China
| | - Shen Pan
- State Key Laboratory of Advanced Welding and Joining of Materials and Structures, School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen 518055, China
| | - Xian-Kui Wei
- College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Changyang Kuo
- Department of Electrophysics, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu 30076, Taiwan
| | - Suguru Yoshida
- Materials Research Institute and Department of Material Science & Engineering, Pennsylvania State University, University Park, PA 16802, USA
| | - Yu-Chieh Ku
- Department of Electrophysics, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
| | - Shuai Wang
- State Key Laboratory of Advanced Welding and Joining of Materials and Structures, School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen 518055, China
| | - Zhenni Yang
- College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Sankalpa Hazra
- Materials Research Institute and Department of Material Science & Engineering, Pennsylvania State University, University Park, PA 16802, USA
| | - Kelvin H. L. Zhang
- College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Xingjun Liu
- State Key Laboratory of Advanced Welding and Joining of Materials and Structures, School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen 518055, China
| | - Yunlong Tang
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
| | - Yin-Lian Zhu
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
| | - Chun-Fu Chang
- Max-Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany
| | - Sujit Das
- Materials Research Centre, Indian Institute of Science, Bangalore 560012, India
| | - Xiuliang Ma
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
| | - Lang Chen
- Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
| | - Bin Xu
- Jiangsu Key Laboratory of Frontier Material Physics and Devices, School of Physical Science and Technology, Soochow University, Suzhou 215006, China
| | - Venkatraman Gopalan
- Materials Research Institute and Department of Material Science & Engineering, Pennsylvania State University, University Park, PA 16802, USA
| | - Laurent Bellaiche
- Physics Department and Institute for Nanoscience and Engineering, University of Arkansas, Fayetteville, AR 72701, USA
- Department of Materials Science and Engineering, Tel Aviv University, Ramat Aviv, Tel Aviv 6997801, Israel
| | - Lane W. Martin
- Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, USA
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Zuhuang Chen
- State Key Laboratory of Advanced Welding and Joining of Materials and Structures, School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen 518055, China
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4
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Gabov A, Kato D, Ubukata H, Aso R, Kakudou N, Fujita K, Suzuki H, Tomita O, Saeki A, Abe R, Karazhanov SZ, Kageyama H. Internal strain-driven bond manipulation and band engineering in Bi 2-x Sb x YO 4Cl photocatalysts with triple fluorite layers. Chem Sci 2024; 15:11856-11864. [PMID: 39092095 PMCID: PMC11290426 DOI: 10.1039/d4sc02092h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2024] [Accepted: 06/07/2024] [Indexed: 08/04/2024] Open
Abstract
In extended solid-state materials, the manipulation of chemical bonds through redox reactions often leads to the emergence of interesting properties, such as unconventional superconductivity, which can be achieved by adjusting the Fermi level through, e.g., intercalation and pressure. Here, we demonstrate that the internal 'biaxial strain' in tri-layered fluorite oxychloride photocatalysts can regulate bond formation and cleavage without redox processes. We achieve this by synthesizing the isovalent solid solution Bi2-x Sb x YO4Cl, which undergoes a structural phase transition from the ideal Bi2YO4Cl structure to the Sb2YO4Cl structure with (Bi,Sb)4O8 rings. Initially, substitution of smaller Sb induces expected lattice contraction, but further substitution beyond x > 0.6 triggers an unusual lattice expansion before the phase transition at x = 1.5. Detailed analysis reveals structural instability at high x values, characterized by Sb-O underbonding, which is attributed to tensile strain exerted from the inner Y sublayer to the outer (Bi,Sb)O sublayer within the triple fluorite block - a concept well-recognized in thin film studies. This concept also explains the formation of zigzag Bi-O chains in Bi2MO4Cl (M = Bi, La). The Sb substitution in Bi2-x Sb x YO4Cl elevates the valence band maximum, resulting in a minimized bandgap of 2.1 eV around x = 0.6, which is significantly smaller than those typically observed in oxychlorides, allowing the absorption of a wider range of light wavelengths. Given the predominance of materials with a double fluorite layer in previous studies, our findings highlight the potential of compounds endowed with triple or thicker fluorite layers as a novel platform for band engineering that utilizes biaxial strain from the inner layer(s) to finely control their electronic structures.
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Affiliation(s)
- Artem Gabov
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University Kyoto 615-8510 Japan
- National Research Nuclear University MEPhI (Moscow Engineering Physics Institute) 31 Kashirskoye Shosse Moscow 115409 Russia
| | - Daichi Kato
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University Kyoto 615-8510 Japan
| | - Hiroki Ubukata
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University Kyoto 615-8510 Japan
| | - Ryotaro Aso
- Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University Fukuoka 819-0395 Japan
| | - Naoji Kakudou
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University Kyoto 615-8510 Japan
| | - Koji Fujita
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University Kyoto 615-8510 Japan
| | - Hajime Suzuki
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University Kyoto 615-8510 Japan
| | - Osamu Tomita
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University Kyoto 615-8510 Japan
| | - Akinori Saeki
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University Osaka 565-0871 Japan
| | - Ryu Abe
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University Kyoto 615-8510 Japan
| | - Smagul Zh Karazhanov
- Department for Solar Energy Materials and Technologies, Institute for Energy Technology Kjeller NO 2027 Norway
| | - Hiroshi Kageyama
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University Kyoto 615-8510 Japan
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5
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Kato D, Suzuki H, Abe R, Kageyama H. Band engineering of layered oxyhalide photocatalysts for visible-light water splitting. Chem Sci 2024; 15:11719-11736. [PMID: 39092126 PMCID: PMC11290441 DOI: 10.1039/d4sc02093f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2024] [Accepted: 06/25/2024] [Indexed: 08/04/2024] Open
Abstract
The band structure offers fundamental information on electronic properties of solid state materials, and hence it is crucial for solid state chemists to understand and predict the relationship between the band structure and electronic structure to design chemical and physical properties. Here, we review layered oxyhalide photocatalysts for water splitting with a particular emphasis on band structure control. The unique feature of these materials including Sillén and Sillén-Aurivillius oxyhalides lies in their band structure including a remarkably high oxygen band, allowing them to exhibit both visible light responsiveness and photocatalytic stability unlike conventional mixed anion compounds, which show good light absorption, but frequently encounter stability issues. For band structure control, simple strategies effective in mixed-anion compounds, such as anion substitution forming high energy p orbitals in accordance with its electronegativity, is not effective for oxyhalides with high oxygen bands. We overview key concepts for band structure control of oxyhalide photocatalysts such as lone-pair interactions and electrostatic interactions. The control of the band structure of inorganic solid materials is a crucial challenge across a wide range of materials chemistry fields, and the insights obtained by the development of oxyhalide photocatalysts are expected to provide knowledge for diverse materials chemistry.
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Affiliation(s)
- Daichi Kato
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University Nishikyo-ku Kyoto 615-8510 Japan
| | - Hajime Suzuki
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University Nishikyo-ku Kyoto 615-8510 Japan
| | - Ryu Abe
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University Nishikyo-ku Kyoto 615-8510 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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6
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Yoo SJ, Hwang J, Jang J, Jang JH, Park CH, Lee JH, Choi MY, Yuk JM, Choi SY, Lee J, Chung SY. Comparing the Impacts of Strain Types on Oxygen-Vacancy Formation in a Perovskite Oxide via Nanometer-Scale Strain Fields. ACS NANO 2024; 18:18465-18476. [PMID: 38888543 DOI: 10.1021/acsnano.4c03783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/20/2024]
Abstract
The utilization of an in-plane lattice misfit in an oxide epitaxially grown on another oxide with a different lattice parameter is a well-known approach to induce strains in oxide materials. However, achieving a sufficiently large misfit strain in this heteroepitaxial configuration is usually challenging, unless the thickness of the grown oxide is kept well below a critical value to prevent the formation of misfit dislocations at the interface for relaxation. Instead of adhering to this conventional approach, here, we employ nanometer-scale large strain fields built around misfit dislocations to examine the effects of two distinct types of strains─tension and compression─on the generation of oxygen vacancies in heteroepitaxial LaCoO3 films. Our atomic-level observations, coupled with local electron-beam irradiation, clarify that the in-plane compression notably suppresses the creation of oxygen vacancies, whereas the formation of vacancies is facilitated under tensile strain. Demonstrating that the defect generation can considerably vary with the type of strain, our study highlights that the experimental approach adopted in this work is applicable to other oxide systems when investigating the strain effects on vacancy formation.
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Affiliation(s)
- Seung Jo Yoo
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea
- Center for Research Equipment, Korea Basic Science Institute, Daejeon 34133, Korea
| | - Jaejin Hwang
- Department of Physics, Pusan National University, Busan 46241, Korea
| | - Jinhyuk Jang
- Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang 37673, Korea
| | - Jae Hyuck Jang
- Center for Research Equipment, Korea Basic Science Institute, Daejeon 34133, Korea
| | - Chang Hyun Park
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea
| | - Ji-Hyun Lee
- Center for Research Equipment, Korea Basic Science Institute, Daejeon 34133, Korea
| | - Min Yeong Choi
- Center for Research Equipment, Korea Basic Science Institute, Daejeon 34133, Korea
| | - Jong Min Yuk
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea
| | - Si-Young Choi
- Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang 37673, Korea
| | - Jaekwang Lee
- Department of Physics, Pusan National University, Busan 46241, Korea
| | - Sung-Yoon Chung
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea
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7
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Shin Y, Poeppelmeier KR, Rondinelli JM. Informatics-Based Learning of Oxygen Vacancy Ordering Principles in Oxygen-Deficient Perovskites. Inorg Chem 2024; 63:12785-12802. [PMID: 38954760 DOI: 10.1021/acs.inorgchem.4c01198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/04/2024]
Abstract
Ordered oxygen vacancies (OOVs) in perovskites can exhibit long-range order and may be used to direct materials properties through modifications in electronic structures and broken symmetries. Based on the various vacancy patterns observed in previously known compounds, we explore the ordering principles of oxygen-deficient perovskite oxides with ABO2.5 stoichiometry to identify other OOV variants. We performed first-principles calculations to assess the OOV stability on a data set of 50 OOV structures generated from our bespoke algorithm. The algorithm employs uniform planar vacancy patterns on (111) pseudocubic perovskite layers and the approach proves effective for generating stable OOV patterns with minimal computational loads. We find as expected that the major factors determining the stability of OOV structures include coordination preferences of transition metals and elastic penalties resulting from the assemblies of polyhedra. Cooperative rotational modes of polyhedra within the OOV structures reduce elastic instabilities by optimizing the bond valence of A- and B cations. This finding explains the observed formation of vacancy channels along low-index crystallographic directions in prototypical OOV phases. The identified ordering principles enable us to devise other stable vacancy patterns with longer periodicity for targeted property design in yet to be synthesized compounds.
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Affiliation(s)
- Yongjin Shin
- Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, United States
| | - Kenneth R Poeppelmeier
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - James M Rondinelli
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
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8
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Yamamoto T, Otsubo Y, Nagase T, Kosuge T, Azuma M. Synthesis and Structure of Vacancy-Ordered Perovskite Ba 6Ta 2Na 2X 2O 17 (X = P, V): Significance of Structural Model Selection on Discovered Compounds. Inorg Chem 2024; 63:4482-4486. [PMID: 38415588 DOI: 10.1021/acs.inorgchem.3c04545] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/29/2024]
Abstract
Vacancy-ordered 12H-type hexagonal perovskites Ba6Ru2Na2X2O17 (X = P, V) with a (c'cchcc)2 stacking sequence of [BaO3]c, [BaO3]h, and [BaO2]c' layers, where c and h represent a cubic and hexagonal stacking sequence, were previously reported by Quarez et al. in 2003. They also synthesized Ba6Ta2Na2V2O17, but structural refinement was absent. Very recently, Szymanski et al. reported 43 new compounds, including 12H-type Ba6Ta2Na2V2O17, using large-scale ab initio phase-stability data from the Materials Project and Google DeepMind with the assistance of an autonomous laboratory. But their structural refinement was very poor. Here, we report the synthesis and structure of Ba6Ta2Na2V2O17, which does not have 12H-type structure but has a vacancy-ordered 6C-type perovskite with a (c'ccccc) stacking sequence of [BaO3]c and [BaO2]c' layers. We also report the phosphite analogue Ba6Ta2Na2P2O17 as a new compound. We claim an importance of careful structural characterization on newly discovered compounds; otherwise, the database constructed will lose credibility.
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Affiliation(s)
- Takafumi Yamamoto
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Yokohama, Kanagawa 226-8501, Japan
| | - Yuya Otsubo
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Yokohama, Kanagawa 226-8501, Japan
| | - Teppei Nagase
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Yokohama, Kanagawa 226-8501, Japan
| | - Taiki Kosuge
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Yokohama, Kanagawa 226-8501, Japan
| | - Masaki Azuma
- Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Yokohama, Kanagawa 226-8501, Japan
- Kanagawa Institute of Industrial Science and Technology, Ebina, Kanagawa 243-0435, Japan
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9
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Ishida K, Tassel C, Kato D, Ubukata H, Murayama K, Murakami T, Yashima M, Higo Y, Tange Y, Phelan WA, McQueen TM, Kageyama H. Highly Electron-Doped TaON Single-Crystal Growth by a High-Pressure Flux Method. Inorg Chem 2022; 61:11118-11123. [PMID: 35802135 DOI: 10.1021/acs.inorgchem.2c00897] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Transition-metal oxynitrides have a variety of functions such as visible light-responsive catalysts and dielectric materials, but acquiring single crystals necessary to understand inherent properties is difficult and is limited to relatively small sizes (<10 μm) because they easily decompose at high temperatures. Here, we have succeeded in growing platelet single crystals of TaON with a typical size of 50 × 100 × 10 μm3 under a high pressure and high temperature (6 GPa and 1400 °C) using a LiCl flux. Such a harsh condition, in contrast to powder samples synthesized under mild conditions, resulted in the introduction of a large amount of oxygen vacancies (x = 0.06 in TaO1-xN) into the crystal, providing a metallic behavior with a large anisotropy of ρc/ρab ∼ 103. Low-temperature oxygen annealing allows for a single-crystal-to-single-crystal transformation to obtain fully oxidized TaON (yellow) crystals. Needle-like crystals can be obtained when NH4Cl is used as a flux. Furthermore, black Hf2ON2 single crystals are also grown, suggesting that the high-pressure flux method is widely applicable to other transition-metal oxynitrides, with extensive carrier control.
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Affiliation(s)
- Kohdai Ishida
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Cédric Tassel
- 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
| | - Hiroki Ubukata
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Kantaro Murayama
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Taito Murakami
- Department of Electronic Engineering, Graduate School of Engineering, Tohoku University, Sendai 987-8579, Japan
| | - Masatomo Yashima
- Department of Chemistry, School of Science, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551, Japan
| | - Yuji Higo
- Japan Synchrotron Radiation Research Institute, SPring-8, Sayo-gun, Hyogo 679-5198, Japan
| | - Yoshinori Tange
- Japan Synchrotron Radiation Research Institute, SPring-8, Sayo-gun, Hyogo 679-5198, Japan
| | - W Adam Phelan
- Department of Chemistry, The Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Tyrel M McQueen
- Department of Chemistry, The Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Hiroshi Kageyama
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
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10
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Nagase T, Nishikubo T, Fukuda M, Sakai Y, Shigematsu K, Ikeda Y, Nambu Y, Zhang Q, Matsuda M, Mibu K, Azuma M, Yamamoto T. SrV 0.3Fe 0.7O 2.8: A Vacancy-Ordered Fe-Based Perovskite Exhibiting Room-Temperature Magnetoresistance. Inorg Chem 2022; 61:8987-8991. [PMID: 35657337 DOI: 10.1021/acs.inorgchem.2c01137] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report room-temperature (RT) magnetoresistance (MR) in a novel Fe-based perovskite, SrV0.3Fe0.7O2.8. This compound contains ordered oxygen vacancies in every fifth primitive perovskite (111)p plane, leading to a layered structure consisting of triple-octahedral and double-tetrahedral layers. Along with the oxygen vacancies, the transition-metal ions are also ordered: the octahedral sites are occupied by 100% of Fe ions, while the tetrahedral sites are occupied by 25% of Fe ions and 75% of V ions. As a result, SrV0.3Fe0.7O2.8 forms a magnetically striped lattice in which the octahedral layers with 100% of magnetic Fe ions are separated by the diluted magnetic layer. The compound exhibits weak ferromagnetism and shows a large negative MR (-5% at 3 T) at RT, despite the small saturation moment (0.4 μB/Fe atom). Thus, this type of layered compound is promising for further large MR by an increase of magnetization through chemical substitution.
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Affiliation(s)
- Teppei Nagase
- Laboratory for Materials and Structures, Tokyo Institute of Technology, Midori-ku, Yokohama 226-8503, Japan
| | - Takumi Nishikubo
- Laboratory for Materials and Structures, Tokyo Institute of Technology, Midori-ku, Yokohama 226-8503, Japan
- Kanagawa Institute of Industrial Science and Technology, Ebina 243-0435, Japan
| | - Masayuki Fukuda
- Laboratory for Materials and Structures, Tokyo Institute of Technology, Midori-ku, Yokohama 226-8503, Japan
| | - Yuki Sakai
- Laboratory for Materials and Structures, Tokyo Institute of Technology, Midori-ku, Yokohama 226-8503, Japan
- Kanagawa Institute of Industrial Science and Technology, Ebina 243-0435, Japan
| | - Kei Shigematsu
- Laboratory for Materials and Structures, Tokyo Institute of Technology, Midori-ku, Yokohama 226-8503, Japan
- Kanagawa Institute of Industrial Science and Technology, Ebina 243-0435, Japan
| | - Yoichi Ikeda
- Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
| | - Yusuke Nambu
- Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
- Organization for Advanced Studies, Tohoku University, Sendai 980-8577, Japan
- FOREST, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan
| | - Qiang Zhang
- Neutron Scattering Division, Oak Ridge National Laboratory (ORNL), Oak Ridge, Tennessee 37831, United States
| | - Masaaki Matsuda
- Neutron Scattering Division, Oak Ridge National Laboratory (ORNL), Oak Ridge, Tennessee 37831, United States
| | - Ko Mibu
- Department of Physical Science and Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan
| | - Masaki Azuma
- Laboratory for Materials and Structures, Tokyo Institute of Technology, Midori-ku, Yokohama 226-8503, Japan
- Kanagawa Institute of Industrial Science and Technology, Ebina 243-0435, Japan
| | - Takafumi Yamamoto
- Laboratory for Materials and Structures, Tokyo Institute of Technology, Midori-ku, Yokohama 226-8503, Japan
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11
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Zhang Q, Meng F, Gao A, Li X, Jin Q, Lin S, Chen S, Shang T, Zhang X, Guo H, Wang C, Jin K, Wang X, Su D, Gu L, Guo EJ. Dynamics of Anisotropic Oxygen-Ion Migration in Strained Cobaltites. NANO LETTERS 2021; 21:10507-10515. [PMID: 34870440 DOI: 10.1021/acs.nanolett.1c04057] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Orientation control of the oxygen vacancy channel (OVC) is highly desirable for tailoring oxygen diffusion as it serves as a fast transport channel in ion conductors, which is widely exploited in solid-state fuel cells, catalysts, and ion-batteries. Direct observation of oxygen-ion hopping toward preferential vacant sites is a key to clarifying migration pathways. Here we report anisotropic oxygen-ion migration mediated by strain in ultrathin cobaltites via in situ thermal activation in atomic-resolved transmission electron microscopy. Oxygen migration pathways are constructed on the basis of the atomic structure during the OVC switching, which is manifested as the vertical-to-horizontal OVC switching under tensile strain but the horizontal-to-diagonal switching under compression. We evaluate the topotactic structural changes to the OVC, determine the crucial role of the tolerance factor for OVC stability, and establish the strain-dependent phase diagram. Our work provides a practical guide for engineering OVC orientation that is applicable to ionic-oxide electronics.
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Affiliation(s)
- Qinghua Zhang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- Yangtze River Delta Physics Research Center Co. Ltd., Liyang 213300, China
| | - Fanqi Meng
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Ang Gao
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xinyan Li
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Qiao Jin
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Shan Lin
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Shengru Chen
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Tongtong Shang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xing Zhang
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Molecular Nanostructure and Nanotechnology, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Haizhong Guo
- School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450001, China
| | - Can Wang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
| | - Kuijuan Jin
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
| | - Xuefeng Wang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
| | - Dong Su
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
| | - Lin Gu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
| | - Er-Jia Guo
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
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12
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Li HB, Kobayashi S, Zhong C, Namba M, Cao Y, Kato D, Kotani Y, Lin Q, Wu M, Wang WH, Kobayashi M, Fujita K, Tassel C, Terashima T, Kuwabara A, Kobayashi Y, Takatsu H, Kageyama H. Dehydration of Electrochemically Protonated Oxide: SrCoO 2 with Square Spin Tubes. J Am Chem Soc 2021; 143:17517-17525. [PMID: 34647722 DOI: 10.1021/jacs.1c07043] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Controlling oxygen deficiencies is essential for the development of novel chemical and physical properties such as high-Tc superconductivity and low-dimensional magnetic phenomena. Among reduction methods, topochemical reactions using metal hydrides (e.g., CaH2) are known as the most powerful method to obtain highly reduced oxides including Nd0.8Sr0.2NiO2 superconductor, though there are some limitations such as competition with oxyhydrides. Here we demonstrate that electrochemical protonation combined with thermal dehydration can yield highly reduced oxides: SrCoO2.5 thin films are converted to SrCoO2 by dehydration of HSrCoO2.5 at 350 °C. SrCoO2 forms square (or four-legged) spin tubes composed of tetrahedra, in contrast to the conventional infinite-layer structure. Detailed analyses suggest the importance of the destabilization of the SrCoO2.5 precursor by electrochemical protonation that can greatly alter reaction energy landscape and its gradual dehydration (H1-xSrCoO2.5-x/2) for the SrCoO2 formation. Given the applicability of electrochemical protonation to a variety of transition metal oxides, this simple process widens possibilities to explore novel functional oxides.
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Affiliation(s)
- Hao-Bo Li
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Shunsuke Kobayashi
- Nanostructures Research Laboratory, Japan Fine Ceramics Center, Nagoya 456-8587, Japan
| | - Chengchao Zhong
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Morito Namba
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Yu Cao
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Daichi Kato
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Yoshinori Kotani
- Japan Synchrotron Radiation Research Institute, Sayo-cho, Hyogo 679-5198, Japan
| | - Qianmei Lin
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Maokun Wu
- Department of Electronic Science and Engineering and Tianjin Key Laboratory of Photo-Electronic Thin Film Device and Technology, Nankai University, Tianjin 300071, China
| | - Wei-Hua Wang
- Department of Electronic Science and Engineering and Tianjin Key Laboratory of Photo-Electronic Thin Film Device and Technology, Nankai University, Tianjin 300071, China
| | - Masaki Kobayashi
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Koji Fujita
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Cédric Tassel
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Takahito Terashima
- Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Akihide Kuwabara
- Nanostructures Research Laboratory, Japan Fine Ceramics Center, Nagoya 456-8587, Japan
| | - Yoji Kobayashi
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Hiroshi Takatsu
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Hiroshi Kageyama
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
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13
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Miyazaki K, Ochi M, Nishikubo T, Suzuki J, Saito T, Kamiyama T, Kuroki K, Yamamoto T, Azuma M. High-Pressure and High-Temperature Synthesis of Anion-Disordered Vanadium Perovskite Oxyhydrides. Inorg Chem 2021; 60:15751-15758. [PMID: 34613695 DOI: 10.1021/acs.inorgchem.1c02399] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Crystallographic order-disorder phenomena in solid state compounds are of fundamental interest due to intimate relationship between the structure and properties. Here, by using high-pressure and high-temperature synthesis, we obtained vanadium perovskite oxyhydrides Sr1-xNaxVO3-yHy (x = 0, 0.05, 0.1, 0.2) with an anion-disordered structure, which is different from anion-ordered SrVO2H synthesized by topochemical reduction. High-pressure and high-temperature synthesis from nominal composition SrVO2H yielded the anion-disordered perovskite SrVO3-yHy (y ∼ 0.4) with a significant amount of byproducts, while Na substitution resulted in the almost pure anion-disordered perovskite Sr1-xNaxVO3-yHy with an increased amount of hydride anion (y ∼ 0.7 for x = 0.2). The obtained disordered phases for x = 0.1 and 0.2 are paramagnetic with almost temperature-independent electronic conductivity, whereas anion-ordered SrVO2H is an antiferromagnetic insulator. Although we obtained the anion-disordered perovskite under high pressure, a first-principles calculation revealed that the application of pressure stabilizes the ordered phase due to a reduced volume in the ordered structure, suggesting that a further increase of the pressure or reduction of the reaction temperature leads to the anion ordering. This study shows that anion ordering in oxyhydrides can be controlled by changing synthetic pressure and temperature.
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Affiliation(s)
- Kazumasa Miyazaki
- Laboratory for Materials and Structures, Tokyo Institute of Technology, Yokohama, Kanagawa 226-8503, Japan
| | - Masayuki Ochi
- Department of Physics, Osaka University, Toyonaka, Osaka, 560-0043, Japan
| | - Takumi Nishikubo
- Laboratory for Materials and Structures, Tokyo Institute of Technology, Yokohama, Kanagawa 226-8503, Japan
| | - Jinya Suzuki
- Laboratory for Materials and Structures, Tokyo Institute of Technology, Yokohama, Kanagawa 226-8503, Japan
| | - Takashi Saito
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tokai, Ibaraki 319-1106, Japan
| | - Takashi Kamiyama
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tokai, Ibaraki 319-1106, Japan
| | - Kazuhiko Kuroki
- Department of Physics, Osaka University, Toyonaka, Osaka, 560-0043, Japan
| | - Takafumi Yamamoto
- Laboratory for Materials and Structures, Tokyo Institute of Technology, Yokohama, Kanagawa 226-8503, Japan
| | - Masaki Azuma
- Laboratory for Materials and Structures, Tokyo Institute of Technology, Yokohama, Kanagawa 226-8503, Japan.,Kanagawa Institute of Industrial Science and Technology, 705-1 Shimoimaizumi, Ebina 243-0435, Japan
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14
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Hirose Y, Hasegawa T. Exploring Metastable Oxynitrides by Thin Film Growth Approach. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2021. [DOI: 10.1246/bcsj.20210033] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Yasushi Hirose
- Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Tetsuya Hasegawa
- Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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