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Pressure-Induced Collapse of the Guest Eu Off-Centering in Type-I Clathrate Eu8Ga16Ge30
https://repo.qst.go.jp/records/78387
https://repo.qst.go.jp/records/78387116f783b-46f0-4ddd-ac3c-f272457058e8
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2020-01-09 | |||||
| タイトル | ||||||
| タイトル | Pressure-Induced Collapse of the Guest Eu Off-Centering in Type-I Clathrate Eu8Ga16Ge30 | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | journal article | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
Ishimatsu, Naoki
× Ishimatsu, Naoki× Yokoyama, Kei× Takahiro Onimaru× Takabatake, Toshiro× Suekuni, Koichiro× Kawamura, Naomi× Tsutsui, Satoshi× Mizumaki, Masaichiro× Ina, Toshiaki× Watanuki, Tetsu× Cuartero, Vera× Mathon, Olivier× Pascarelli, Sakura× Nishibori, Eiji× Irifune, Tetsuo× Tetsu, Watanuki |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | 我々は、クラスレート化合物の圧力効果の研究を行い、 タイプ-IクラスレートEu8Ga16Ge30において、ケージのオフセンター位置を占めていたEu原子が、13.1万気圧の加圧によりケージの中心位置を占めるという、圧力誘起構造変化を起こすことを明らかにした。また、これらは、高圧下EXAFS実験により明らかにしたものである。 We have revealed the pressure-induced collapse of the guest Eu off-centering in type-I clathrate Eu8Ga16Ge30 by the measurements of extended X-ray absorption fine structure (EXAFS) at the Ge K-edge in a temperature range of 10–300 K. Our analysis of the EXAFS spectra at ambient pressure confirmed that the guest Eu is located in the off-centered positions at Δoffset = 0.39(1) Å away from the center of the Ga/Ge tetradodecahedron cage (14-cage). However, with applying pressure to 13.1 GPa, Δoffset decreases to zero, and the atomic density of Eu is concentrated near the center of the 14-cage with a broad distribution. The present result demonstrates a close relationship between Δoffset and the size of the cage: Δoffset decreases when the 14-cage shrinks by applying pressure. With further compression, we have observed a drastic change in the EXAFS spectra due to amorphization. In the amorphous phase, the first nearest neighbor Ge–Ga/Ge bond is longer than in the crystal phase, whereas the guest Eu atom is located randomly with respect to the Ge atoms. |
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| 書誌情報 |
Journal of the Physical Society of Japan 巻 88, 号 11, p. 114601, 発行日 2019-11 |
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| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 0031-9015 | |||||
| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | 10.7566/JPSJ.88.114601 | |||||
| 関連サイト | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | https://journals.jps.jp/doi/full/10.7566/JPSJ.88.114601 | |||||
