Hexagonal to cubic phase transition in YH3 under high pressure

被引：47

作者：

Palasyuk, T ^{[1
]}

Tkacz, M ^{[1
]}

机构：

[1] Polish Acad Sci, Inst Phys Chem, Dept Solid State Chem, PL-01224 Warsaw, Poland

来源：

SOLID STATE COMMUNICATIONS | 2005年 / 133卷 / 07期

关键词：

yttriurn trihydride; phase transition; high pressure;

D O I：

10.1016/j.ssc.2004.11.035

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

X-ray diffraction studies on bulk yttrium trihydride, in a diamond anvil cell, have been carried out up to 25 GPa. Pressure induced hexagonal-to-cubic phase transformation in YH3 has been found at pressure of about 8 GPa. The lattice parameter of the new cubic phase was determined as equal to 5.28 A. This finding confirms the theoretical predictions based on first principle calculations of such a transformation. Equations of state have been determined for both the hexagonal hcp and cubic fcc YH3 phases. As compared to the pure yttrium metal, bulk modulus for YH3 is about four times bigger. The similarity of this transition to that observed in the other 4-f trivalent hydrides has been discussed. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：477 / 480

页数：4

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