Perovskite-to-Postperovskite Transitions in NaNiF<sub>3</sub> and NaCoF<sub>3</sub> and Disproportionation of NaCoF<sub>3</sub> Postperovskite under High Pressure and High Temperature
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- Hitoshi Yusa
- National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
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- Yuichi Shirako
- Department of Chemistry, Gakushuin University, 1-5-1 Mejiro, Toshima-ku, Tokyo 171-8588, Japan
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- Masaki Akaogi
- Department of Chemistry, Gakushuin University, 1-5-1 Mejiro, Toshima-ku, Tokyo 171-8588, Japan
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- Hiroshi Kojitani
- Department of Chemistry, Gakushuin University, 1-5-1 Mejiro, Toshima-ku, Tokyo 171-8588, Japan
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- Naohisa Hirao
- Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Sayo-cho 679-5198, Japan
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- Yasuo Ohishi
- Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Sayo-cho 679-5198, Japan
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- Takumi Kikegawa
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba 305-0801, Japan
書誌事項
- 公開日
- 2012-06-01
- 資源種別
- journal article
- DOI
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- 10.1021/ic300118d
- 公開者
- American Chemical Society (ACS)
この論文をさがす
説明
High-pressure structural phase transitions in NaNiF(3) and NaCoF(3) were investigated by conducting in situ synchrotron powder X-ray diffraction experiments using a diamond anvil cell. The perovskite phases (GdFeO(3) type) started to transform into postperovskite phases (CaIrO(3) type) at about 11-14 GPa, even at room temperature. The transition pressure is much lower than those of oxide perovskites. The anisotropic compression behavior led to heavily tilted octahedra that triggered the transition. Unlike oxide postperovskites, fluoropostperovskites remained after decompression to 1 atm. The postperovskite phase in NaCoF(3) broke down into a mixture of unknown phases after laser heating above 26 GPa, and the phases changed into amorphous ones when the pressure was released. High-pressure and high-temperature experiments using a multianvil apparatus were also conducted to elucidate the phase relations in NaCoF(3). Elemental analysis of the recovered amorphous samples indicated that the NaCoF(3) postperovskite disproportionated into two phases. This kind of disproportionation was not evident in NaNiF(3) even after laser heating at 54 GPa. In contrast to the single postpostperovskite phase reported in NaMgF(3), such a postpostperovskite phase was not found in the present compounds.
収録刊行物
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- Inorganic Chemistry
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Inorganic Chemistry 51 (12), 6559-6566, 2012-06-01
American Chemical Society (ACS)
