Pressure-induced phase transition of BaH2:: post Ni2In phase

被引：34

作者：

Kinoshita, K. ^{[1
]}

Nishimura, M. ^{[1
]}

Akahama, Y. ^{[1
]}

Kawamura, H. ^{[1
]}

机构：

[1] Univ Hyogo, Grad Sch Mat Sci, Kamigori, Hyogo 6781297, Japan

来源：

SOLID STATE COMMUNICATIONS | 2007年 / 141卷 / 02期

基金：

日本学术振兴会;

关键词：

metal hydride; phase transition; high pressure; X-ray;

D O I：

10.1016/j.ssc.2006.09.045

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Up to now a Ni2In structure is a final step in the structural sequence of ionic AX(2) compounds under high pressure. Powder X-ray diffraction experiments on BaH2 were performed at room temperature and high pressures up to 69 GPa. Successive phase transformations were observed to occur in two stages. The first was from the cotunnite to the Ni2In structure at 2.5 GPa. The second transition commenced at pressures around 50 GPa and was completed at 65 GPa. At the transition the arrangement of a cation sublattice changes from an hcp to a simple hexagonal lattice. This is the first observation of the post Ni2In phase. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：69 / 72

页数：4

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