Formation of superabundant vacancies in metal hydrides at high temperatures

被引:89
作者
Fukai, Y
机构
[1] Department of Physics, Chuo University, Kasuga, Bunkyo-ku, Tokyo
关键词
superabundant vacancies; metal hydrides;
D O I
10.1016/0925-8388(95)01834-4
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
It has been found from X-ray diffraction on several M-H systems under high p, T conditions that a large number of M-atom vacancies amounting to ca. 20 at.% are formed at high temperatures, leading to a vacancy-ordered L1(2) structure in some f.c.c. hydrides. The energetics of vacancy formation in hydrides suggests that defect-hydrides containing many vacancies are generally more stable thermodynamically than ordinary defect-free hydrides and therefore most phase diagrams of M-H systems reported heretofore are metastable.
引用
收藏
页码:35 / 40
页数:6
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