Pressure-induced collapse of the guest EU off-centering in type-I clathrate EU8Ga16Ge30

Naoki Ishimatsu, Kei Yokoyama, Takahiro Onimaru, Toshiro Takabatake, Koichiro Suekuni, Naomi Kawamura, Satoshi Tsutsui, Masaichiro Mizumaki, Toshiaki Ina, Tetsu Watanuki, Vera Cuartero, Olivier Mathon, Sakura Pascarelli, Eiji Nishibori, Tetsuo Irifune

研究成果: ジャーナルへの寄稿記事

抄録

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.

元の言語英語
記事番号114601
ジャーナルjournal of the physical society of japan
88
発行部数11
DOI
出版物ステータス出版済み - 1 1 2019

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clathrates
fine structure
x rays
atoms
crystals
temperature

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

これを引用

Pressure-induced collapse of the guest EU off-centering in type-I clathrate EU8Ga16Ge30 . / Ishimatsu, Naoki; Yokoyama, Kei; Onimaru, Takahiro; Takabatake, Toshiro; Suekuni, Koichiro; Kawamura, Naomi; Tsutsui, Satoshi; Mizumaki, Masaichiro; Ina, Toshiaki; Watanuki, Tetsu; Cuartero, Vera; Mathon, Olivier; Pascarelli, Sakura; Nishibori, Eiji; Irifune, Tetsuo.

:: journal of the physical society of japan, 巻 88, 番号 11, 114601, 01.01.2019.

研究成果: ジャーナルへの寄稿記事

Ishimatsu, N, Yokoyama, K, Onimaru, T, Takabatake, T, Suekuni, K, Kawamura, N, Tsutsui, S, Mizumaki, M, Ina, T, Watanuki, T, Cuartero, V, Mathon, O, Pascarelli, S, Nishibori, E & Irifune, T 2019, 'Pressure-induced collapse of the guest EU off-centering in type-I clathrate EU8Ga16Ge30 ', journal of the physical society of japan, 巻. 88, 番号 11, 114601. https://doi.org/10.7566/JPSJ.88.114601
Ishimatsu, Naoki ; Yokoyama, Kei ; Onimaru, Takahiro ; Takabatake, Toshiro ; Suekuni, Koichiro ; Kawamura, Naomi ; Tsutsui, Satoshi ; Mizumaki, Masaichiro ; Ina, Toshiaki ; Watanuki, Tetsu ; Cuartero, Vera ; Mathon, Olivier ; Pascarelli, Sakura ; Nishibori, Eiji ; Irifune, Tetsuo. / Pressure-induced collapse of the guest EU off-centering in type-I clathrate EU8Ga16Ge30 :: journal of the physical society of japan. 2019 ; 巻 88, 番号 11.
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abstract = "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) {\AA} 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.",
author = "Naoki Ishimatsu and Kei Yokoyama and Takahiro Onimaru and Toshiro Takabatake and Koichiro Suekuni and Naomi Kawamura and Satoshi Tsutsui and Masaichiro Mizumaki and Toshiaki Ina and Tetsu Watanuki and Vera Cuartero and Olivier Mathon and Sakura Pascarelli and Eiji Nishibori and Tetsuo Irifune",
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AU - Ishimatsu, Naoki

AU - Yokoyama, Kei

AU - Onimaru, Takahiro

AU - Takabatake, Toshiro

AU - Suekuni, Koichiro

AU - Kawamura, Naomi

AU - Tsutsui, Satoshi

AU - Mizumaki, Masaichiro

AU - Ina, Toshiaki

AU - Watanuki, Tetsu

AU - Cuartero, Vera

AU - Mathon, Olivier

AU - Pascarelli, Sakura

AU - Nishibori, Eiji

AU - Irifune, Tetsuo

PY - 2019/1/1

Y1 - 2019/1/1

N2 - 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.

AB - 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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