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, 107 (2), 025501

Structural and Valence Changes of Europium Hydride Induced by Application of High-Pressure H₂

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Structural and Valence Changes of Europium Hydride Induced by Application of High-Pressure H₂

T Matsuoka et al. Phys Rev Lett.

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Abstract

Europium hydride EuH(x), when exposed to high-pressure H₂, has been found to exhibit the following structural and valence changes: Pnma(x = 2, divalent) → P6₃/mmc(x = 2, 7.2-8.7 GPa) → I4/m(x > 2, 8.7-9.7 GPa) → I4/mmm(x > 2, 9.7 GPa-,trivalent). With a trivalent character and a distorted cubic fcc structure, the I4/mmm structure is the β phase 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.

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