Space Group Determination of Al2(WO4)3 using Convergent-Beam Electron Diffraction
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概要
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The space-group symmetries of a negative thermal expansion material Al2(WO4)3 that undergoes a structural phase transformation at $T_{\text{c}}=-22$ °C have been investigated using convergent-beam electron diffraction. It has been confirmed that the space group of the room-temperature phase of Al2(WO4)3, which shows slightly negative thermal expansion, is orthorhombic Pbcn (No. 60). The space group of the low-temperature phase of Al2(WO4)3, which shows positive thermal expansion, has been determined to be monoclinic $P112_{1}/n$ (No. 14) with the lattice of $\mathbf{a}_{\text{m}}=\mathbf{a}_{\text{o}}-\mathbf{b}_{\text{o}}$, $\mathbf{b}_{\text{m}}=2\mathbf{b}_{\text{o}}$, and $\mathbf{c}_{\text{m}}=\mathbf{c}_{\text{o}}$.
- 2008-06-25
著者
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Hashimoto Takuya
Department Of Applied Physics College Of Humanities And Sciences Nihon University
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TSUDA Kenji
Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University
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Tsuda Kenji
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
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Ogata Yoichiro
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
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Hashimoto Takuya
Department of Integrated Sciences in Physics and Biology, College of Humanities and Sciences, Nihon University, 3-25-40 Sakurajosui, Setagaya-ku, Tokyo 156-8550, Japan
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OGATA Yoichiro
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
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