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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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Yasunaga T, Kobayashi M, Oqmhula K, Qi H, Ichibha T, Hongo K, Yamamoto S, Maezono R, Mitsuishi M, Osada M, Kato H, Kakihana M. Multiemission of Ce 3+ from a Single Crystallographic Site Induced by Disordering of Ions. Inorg Chem 2024; 63:1288-1295. [PMID: 38175191 DOI: 10.1021/acs.inorgchem.3c03789] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2024]
Abstract
White-light emission with a single activator is an attractive function of phosphors. In this work, we investigated the photoluminescence properties of Ca5.7Y1.3Si7O16.7N3.3, which is a compound denoted as Ca4+xY3-xSi7O15+xN5-x discovered by our group, with Ce-activation using optical measurements and density functional theory (DFT) calculation. Samples showed a tunable emission from purple to white under ultraviolet (UV) light. In this compound, Ca and Y as well as anions are distributed disorderly, and Ca/Y ions occupy two crystallographically distinct sites; those sites are possible sites for Ce substitution. DFT calculation and structural refinement revealed that the tunable emission was generated by Ce at the crystallographically equivalent site but with distinct local structures caused by the disordering of cations and anions. As far as we know, this is the first report about a white-light-emitting phosphor with only Ce activation.
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Affiliation(s)
- Takuya Yasunaga
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan
| | - Makoto Kobayashi
- Institute of Materials and Systems for Sustainability, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
| | - Kenji Oqmhula
- School of Information Science, JAIST (Japan Advanced Institute of Science and Technology), Asahidai 1-1, Nomi, Ishikawa 923-1292, Japan
| | - Huan Qi
- School of Information Science, JAIST (Japan Advanced Institute of Science and Technology), Asahidai 1-1, Nomi, Ishikawa 923-1292, Japan
| | - Tom Ichibha
- School of Information Science, JAIST (Japan Advanced Institute of Science and Technology), Asahidai 1-1, Nomi, Ishikawa 923-1292, Japan
| | - Kenta Hongo
- Research Center for Advanced Computing Infrastructure, JAIST (Japan Advanced Institute of Science and Technology), Asahidai 1-1, Nomi, Ishikawa 923-1292, Japan
| | - Shunsuke Yamamoto
- Graduate School of Engineering, Tohoku University, 6-6-11, Aramaki Aza Aoba, Aoba-ku, Sendai 980-8579, Japan
| | - Ryo Maezono
- School of Information Science, JAIST (Japan Advanced Institute of Science and Technology), Asahidai 1-1, Nomi, Ishikawa 923-1292, Japan
| | - Masaya Mitsuishi
- Graduate School of Engineering, Tohoku University, 6-6-11, Aramaki Aza Aoba, Aoba-ku, Sendai 980-8579, Japan
| | - Minoru Osada
- Institute of Materials and Systems for Sustainability, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
- Research Center for Crystalline Materials Engineering, Nagoya University, Nagoya 464-8601, Japan
| | - Hideki Kato
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan
| | - Masato Kakihana
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan
- Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
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Utimula K, Yano M, Kimoto H, Hongo K, Nakano K, Maezono R. Feature Space of XRD Patterns Constructed by an Autoencoder. ADVANCED THEORY AND SIMULATIONS 2022. [DOI: 10.1002/adts.202200613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Keishu Utimula
- School of Materials Science JAIST Asahidai 1‐1 Nomi Ishikawa 923‐1292 Japan
| | - Masao Yano
- Toyota Motor Corporation 1, Toyota‐cho Toyota Aichi 471‐8572 Japan
| | - Hiroyuki Kimoto
- Toyota Motor Corporation 1, Toyota‐cho Toyota Aichi 471‐8572 Japan
| | - Kenta Hongo
- Research Center for Advanced Computing Infrastructure JAIST Asahidai 1‐1 Nomi Ishikawa 923‐1292 Japan
| | - Kousuke Nakano
- School of Information Science JAIST Asahidai 1‐1 Nomi Ishikawa 923‐1292 Japan
| | - Ryo Maezono
- School of Information Science JAIST Asahidai 1‐1 Nomi Ishikawa 923‐1292 Japan
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