Investigation of structural states in the series MGaSiO4, MAlGeO4, MGaGeO4 (M = Na,K) |
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| Affiliation: | 1. School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, PR China;2. Key Lab of Functional Materials for Electronic Information (B), Ministry of Education, Wuhan 430074, PR China;1. Fujian Key Laboratory of Functional Materials and Applications, School of Materials Science and Engineering, Xiamen University of Technology, Xiamen 361024, China;2. College of Materials Science, Xiamen University, Xiamen 361024, China;3. Department of Physics, Pukyong National University, Busan 608-737, South Korea;1. University of Bremen, Institute for Inorganic Chemistry and Crystallography, Leobener Str. 7, 28359 Bremen, Germany;2. MAPEX Center for Materials and Processes, Bibliotheksstr. 1, 28359 Bremen, Germany;3. University of Oldenburg, Institute for Technical Chemistry, Carl-von-Ossietzky Str. 9-11, 26129 Oldenburg, Germany;1. Department of Chemical Engineering, Zhenjiang College, Zhenjiang 212000, People''s Republic of China;2. School of Environmental & Chemical Engineering, Jiangsu University of Science & Technology, Zhenjiang 212000, People''s Republic of China;1. School of Materials and Chemical Engineering, Xi''an Technological University, Xi''an 710021, PR China;2. School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, PR China |
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| Abstract: | MGaSiO4, MAlGeO4, and MGaGeO4 phases (M = Na, K) have been synthesized using flux, hydrothermal, and melt growth techniques and characterized by TEM and single crystal and powder X-ray diffraction. The K compounds crystallize with a (2√3A, C) hexagonal unit cell which is a superstructure of the (A, C) hexagonal kalsilite (KAlSiO4) cell. The room-temperature polymorphs of the Na compounds crystallize with a (√3A, 3A, C, γ ⋍ 90°) monoclinic cell and are isostructural with beryllonite (NaBePO4). TEM data suggest that they transform to a kalsilite-like (√3A, C) hexagonal cell at high temperature. |
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