Structural and valence changes of europium hydride induced by application of high-pressure H₂.
Structural and valence changes of europium hydride induced by application of high-pressure H₂.
复制标题
高压氢气引起氢化铕的结构和价态变化。
DOI：
10.1103/physrevlett.107.025501
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发表时间：
2011
影响因子：
8.6
通讯作者：
K. Aoki
中科院分区：
文献类型：
--
作者：
Takahiro Matsuoka;H. Fujihisa;N. Hirao;Yasuo Ohishi;T. Mitsui;R. Masuda;M. Seto;Y. Yoda;K. Shimizu;Akihiko Machida;K. Aoki
氢化铕EuH（x）在高压氢气氛下会发生如下结构和价态变化：Pnma（x = 2，二价）→ P6_x/mmc（x = 2，7.2-8.7 GPa）→ I4/m（x > 2，8.7-9.7 GPa）→ I4/mmm（x > 2，9.7 GPa-，三价）。具有三价特征和畸变立方fcc结构的I4/mmm结构是其它稀土金属氧化物中常见的β相。我们的研究清楚地表明，EuH（x）不再是稀土金属氧化物的不规则成员。
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.