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Xu Q, Su Y, Tang Y, Wang Z, Lu L, Tang L. Low temperature synthesis of oxyfluoride CsTi2O2.85F3.15 from a layered oxide Cs0.68Ti1.83O4. J SOLID STATE CHEM 2022. [DOI: 10.1016/j.jssc.2022.123368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Luminescence and Scintillation in the Niobium Doped Oxyfluoride Rb4Ge5O9F6:Nb. INORGANICS 2022. [DOI: 10.3390/inorganics10060083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
A new niobium-doped inorganic scintillating oxyfluoride, Rb4Ge5O9F6:Nb, was synthesized in single crystal form by high-temperature flux growth. The host structure, Rb4Ge5O9F6, crystallizes in the orthorhombic space group Pbcn with lattice parameters a = 6.98430(10) Å, b = 11.7265(2) Å, and c = 19.2732(3) Å, consisting of germanium oxyfluoride layers made up of Ge3O9 units connected by GeO3F3 octahedra. In its pure form, Rb4Ge5O9F6 shows neither luminescence nor scintillation but when doped with niobium, Rb4Ge5O9F6:Nb exhibits bright blue luminescence and scintillation. The isostructural doped structure, Rb4Ge5O9F6:Nb, crystallizes in the orthorhombic space group Pbcn with lattice parameters a = 6.9960(3) Å, b = 11.7464(6) Å, and c = 19.3341(9) Å. X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) measurements suggest that the niobium is located in an octahedral coordination environment. Optical measurements inform us that the niobium dopant acts as the activator. The synthesis, structure, and optical properties are reported, including radioluminescence (RL) measurements under X-ray irradiation.
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Chiba Y, Shibata K, Takatsu H, Fujii K, Saito M, Kageyama H, Maeda K, Yashima M, Motohashi T. Electrochemical Crystal Growth of Titanium Oxyfluorides-A Strategy for Development of Electron-Doped Materials. Inorg Chem 2021; 60:14613-14621. [PMID: 34463090 DOI: 10.1021/acs.inorgchem.1c01640] [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
We report on the growth of single crystals of an electron-doped titanium oxyfluoride, Li2Ti(O,F)3, employing high-temperature electrolysis of TiO2 with a eutectic Li2MoO4-LiF melt. Greenish octahedral-shaped crystals (∼30 μm in size) with a cubic rocksalt-type structure were successfully obtained by precisely tuning the applied voltage. The temperature-dependent magnetic susceptibility data revealed a paramagnetic behavior at low temperatures, ensuring the presence of Ti3+ ions (mean valence number of +3.78; F/Ti ∼ 0.15). The crystals exhibited clear visible-light absorption and produced H2 from water in the presence of a sacrificial reagent under UV-light irradiation. Li2Ti(O,F)3 more efficiently produced H2 compared with a nondoped oxyfluoride Li5Ti2O6F, likely due to the doped electrons for the former. This work highlights a promising electrochemical approach toward growing electron-doped oxyfluoride crystals.
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Affiliation(s)
- Yusuke Chiba
- Department of Materials and Life Chemistry, Faculty of Engineering, Kanagawa University, Yokohama, Kanagawa 221-8686, Japan.,Japan Society for the Promotion of Science (JSPS), Kojimachi Business Center Building, 5-3-1 Kojimachi, Chiyoda-ku, Tokyo 102-0083, Japan
| | - Kengo Shibata
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-NE-2 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Hiroshi Takatsu
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Kotaro Fujii
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-NE-2 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Miwa Saito
- Department of Materials and Life Chemistry, Faculty of Engineering, Kanagawa University, Yokohama, Kanagawa 221-8686, Japan
| | - Hiroshi Kageyama
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Kazuhiko Maeda
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-NE-2 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Masatomo Yashima
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-NE-2 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Teruki Motohashi
- Department of Materials and Life Chemistry, Faculty of Engineering, Kanagawa University, Yokohama, Kanagawa 221-8686, Japan
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Flux crystal growth of a new BaTa2O6 polymorph, and of the novel tantalum oxyfluoride salt inclusion phase [Ba3F]Ta4O12F: Flux dependent phase formation. J SOLID STATE CHEM 2021. [DOI: 10.1016/j.jssc.2020.121833] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Gu D, Yang W, Chen H, Yang Y, Qin X, Chen L, Wang S, Pan Q. A stable mixed-valent uranium(v,vi) organic framework as a fluorescence thermometer. Inorg Chem Front 2021. [DOI: 10.1039/d1qi00580d] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A stable mixed-valent uranium(v/vi) organic framework with a 3D interpenetrating structure was synthesized, which can be used as a dual-responsive fluorescence temperature sensor based on the fluorescence intensity and fluorescence lifetime.
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Affiliation(s)
- Dongxu Gu
- Key laboratory of Advanced Materials of Tropical Island Resources
- Ministry of Education
- School of Science
- Hainan University
- Haikou
| | - Weiting Yang
- Key laboratory of Advanced Materials of Tropical Island Resources
- Ministry of Education
- School of Science
- Hainan University
- Haikou
| | - Huiping Chen
- Key laboratory of Advanced Materials of Tropical Island Resources
- Ministry of Education
- School of Science
- Hainan University
- Haikou
| | - Yonghang Yang
- Key laboratory of Advanced Materials of Tropical Island Resources
- Ministry of Education
- School of Science
- Hainan University
- Haikou
| | - Xudong Qin
- Key laboratory of Advanced Materials of Tropical Island Resources
- Ministry of Education
- School of Science
- Hainan University
- Haikou
| | - Lu Chen
- Key laboratory of Advanced Materials of Tropical Island Resources
- Ministry of Education
- School of Science
- Hainan University
- Haikou
| | - Song Wang
- Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices
- Hubei University of Arts and Science
- Xiangyang
- P. R. China
| | - Qinhe Pan
- Key laboratory of Advanced Materials of Tropical Island Resources
- Ministry of Education
- School of Science
- Hainan University
- Haikou
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Carone D, Usman M, Klepov VV, Smith MD, Kocevski V, Besmann TM, zur Loye HC. New germanate and mixed cobalt germanate salt inclusion materials: [(Rb 6F)(Rb 4F)][Ge 14O 32] and [(Rb 6F)(Rb 3.1Co 0.9F 0.96)][Co 3.8Ge 10.2O 30F 2]. CrystEngComm 2020. [DOI: 10.1039/d0ce01099e] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Single crystal growth of new germanate salt inclusion materials. [(Rb6F)(Rb4F)][Ge14O32] exhibits room temperature luminescence and [(Rb6F)(Rb3.1Co0.9F0.96)][Co3.8Ge10.2O30F2] demonstrates Co/Ge mixing and an unanticipated Rb/Co inclusion.
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Affiliation(s)
- Darren Carone
- Department of Chemistry and Biochemistry
- University of South Carolina
- Columbia
- USA
| | - Mohammad Usman
- Department of Chemistry and Biochemistry
- University of South Carolina
- Columbia
- USA
| | - Vladislav V. Klepov
- Department of Chemistry and Biochemistry
- University of South Carolina
- Columbia
- USA
| | - Mark D. Smith
- Department of Chemistry and Biochemistry
- University of South Carolina
- Columbia
- USA
| | - Vancho Kocevski
- Nuclear Engineering Program
- Department of Mechanical Engineering
- University of South Carolina
- Columbia
- USA
| | - Theodore M. Besmann
- Nuclear Engineering Program
- Department of Mechanical Engineering
- University of South Carolina
- Columbia
- USA
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Juillerat CA, Klepov VV, Smith MD, zur Loye HC. Targeted crystal growth of uranium gallophosphates via the systematic exploration of the UF 4–GaPO 4–ACl (A = Cs, Rb) phase space. CrystEngComm 2020. [DOI: 10.1039/d0ce00343c] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The flux synthesis of a uranium gallophosphate and a uranium gallate, Cs4[UO2Ga2(PO4)4] and Cs2UO2Ga2O5, and 4 uranium phosphates, [Rb2Rb3.93Cl0.93][(UO2)5(PO4)5], Rb11[(UO2)8(PO4)9], Rb7.6[(UO2)8O8.6F0.4(PO4)2], and Rb6[(UO2)5O2(PO4)4], is reported.
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Affiliation(s)
- Christian A. Juillerat
- Department of Chemistry and Biochemistry
- University of South Carolina
- Columbia
- USA
- Center for Hierarchical Wasteform Materials (CHWM)
| | - Vladislav V. Klepov
- Department of Chemistry and Biochemistry
- University of South Carolina
- Columbia
- USA
| | - Mark D. Smith
- Department of Chemistry and Biochemistry
- University of South Carolina
- Columbia
- USA
| | - Hans-Conrad zur Loye
- Department of Chemistry and Biochemistry
- University of South Carolina
- Columbia
- USA
- Center for Hierarchical Wasteform Materials (CHWM)
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