2014年11月
Postperovskite Phase Transition of ZnGeO3: Comparative Crystal Chemistry of Postperovskite Phase Transition from Germanate Perovskites
INORGANIC CHEMISTRY
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- 巻
- 53
- 号
- 21
- 開始ページ
- 11732
- 終了ページ
- 11739
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1021/ic501958y
- 出版者・発行元
- AMER CHEMICAL SOC
The postperovskite phase of ZnGeO3 was confirmed by laser heating experiments of the perovskite phase under 110-130 GPa at high temperature. Ab initio calculations indicated that the phase transition occurs at 133 GPa at 0 K. This postperovskite transition pressure is significantly higher than those reported for other germanates, such as MnGeO3 and MgGeO3. The comparative crystal chemistry of the perovskite-to-postperovskite transition suggests that a relatively elongated b-axis in the low-pressure range resulted in the delay in the transition to the postperovskite phase. Similar to most GdFeO3-type perovskites that transform to the CaIrO3-type postperovskite phase, ZnGeO3 perovskite eventually transformed to the CaIrO3-type postperovskite phase at a critical rotational angle of the GeO6 octahedron. The formation of the postperovskite structure at a very low critical rotational angle for MnGeO3 suggests that relatively large divalent cations likely break down the corner-sharing GeO6 frameworks without a large rotation of GeO6 to form the postperovskite phase.
- リンク情報
- ID情報
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- DOI : 10.1021/ic501958y
- ISSN : 0020-1669
- eISSN : 1520-510X
- Web of Science ID : WOS:000344307400042