ISOTOPE DEPENDENCE OF HYDROGEN DIFFUSION IN METALS

被引：21

作者：

TEICHLER, H ^{[1
]}

机构：

[1] MAX PLANCK INST MET FORSCH,INST PHYS,D-7000 STUTTGART 80,FED REP GER

来源：

ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-WIESBADEN | 1979年 / 114卷

关键词：

Condon approximation; Hydrogen diffusion; Isotope dependence;

D O I：

10.1524/zpch.1979.114.114.155

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：

Results of recent theoretical investigations about the isotope dependence of hydrogen diffusion in fee metals are reported which are based on a detailed analysis of multiphonon transitions beyond the Condon approximation. It is deduced that at high temperatures latticeactivated over-barrier transitions predominate (for Cu above about 150 K) whereas at lower temperatures quantum-mechanical tunneling transitions are of importance. Assuming an octahedral-tetrahedral-octahedral interstitial-site diffusion-path the theory yields for hydrogen diffusion in Cu the correct order of magnitude for the activation energy and is capable to describe the experimentally observed “inverse” isotope dependence. © by Akademische Verlagsgesellschaft

引用

页码：155 / 163

页数：9