EVIDENCE OF COPIOUS VACANCY FORMATION IN NI AND PD UNDER A HIGH HYDROGEN PRESSURE

被引:226
作者
FUKAI, Y
OKUMA, N
机构
[1] Department of Physics, Chuo University, Tokyo
来源
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS | 1993年 / 32卷 / 9A期
关键词
VACANCY FORMATION; HYDROGEN EFFECT; HIGH PRESSURE; ENHANCED DIFFUSION; NI; PD;
D O I
10.1143/JJAP.32.L1256
中图分类号
O59 [应用物理学];
学科分类号
摘要
From in situ observation of X-ray diffraction of Ni and Pd under a high hydrogen pressure (congruent-to 5 GPa) and temperatures (less-than-or-equal-to 800-degrees-C), anomalous lattice contraction of the hydride was found to occur in 2 approximately 3 h. This contraction, amounting to approximately 0.5 angstrom3 per a metal atom, remained in the recovered specimen even after the hydrogen was removed by heating to 400-degrees-C, but was annealed out at 800-degrees-C. The concentration of vacancies responsible for this effect is estimated at approximately 20% of metal-atom sites. Anomalous concentration dependence of the hydrogen-induced volume and enhanced diffusion of metal atoms are explained in terms of this effect.
引用
收藏
页码:L1256 / L1259
页数:4
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