Structural and valence changes of europium hydride induced by application of high-pressure H $_{2}$

Matsuoka, Takahiro*; Fujihisa, Hiroshi*; Hirao, Naohisa*; Oishi, Yasuo*; Mitsui, Takaya; Masuda, Ryo; Seto, Makoto*; Yoda, Yoshitaka*; Shimizu, Katsuya*; Machida, Akihiko; Aoki, Katsutoshi

Europium-hydride EuH $_{x}$ exposed to high-pressure H $_{2}$ conditions has been found to exhibit structural and valence changes, (=2, divalent) 63/ (=2, 7.2-8.7 GPa) 4/ (2, 8.7-9.7 GPa) 4/ (2, 9.7 GPa-, trivalent). Having trivalent character and distorted cubic fcc structure, the 4/ structure is the -phase which has been commonly observed for other rare-earth metal hydrides. Our study clearly demonstrates that EuH $_{x}$ is no longer an "irregular" member of the rare earth metal hydrides.

Language	:	English
Journal	:	Physical Review Letters
Volume	:	107
Number	:	2
Pages	:	p.025501_1 - 025501_4
Publication Year/Month	:	2011/07
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Paper URL	:	https://doi.org/10.1103/PhysRevLett.107.025501
DOI for research data	:
Keywords	:	no keyword
Research Facility	:	SPring-8(大型放射光施設)
Press Release	:	A face-centered-cubic lattice is found to a metal framework suitable to contain a mass of hydrogen commonly for rare-earth metals 希土類金属水素化物の結晶構造の一般則を確立; 水素吸蔵材料の設計指針に重要な知見を提供
Article of JAEA R&D Review	:
Cooperating Institute	:	新エネルギー・産業技術総合開発機構

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Registration No. : AA20110201
JAEA Abstracts No. : 39001025
Paper Submission No. : 9284

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