ON DIFFUSION BY THE DISSOCIATIVE MECHANISM IN THE CASE OF A FINITE FOREIGN-ATOM SOURCE

被引：15

作者：

STOLWIJK, NA

机构：

[1] Institut für Metallforschung, Universität Münster

来源：

PHYSICA STATUS SOLIDI B-BASIC RESEARCH | 1990年 / 157卷 / 01期

关键词：

D O I：

10.1002/pssb.2221570109

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The dissociative mechanism describes long‐distance transport of mainly substitutionally dissolved impurities (Xs) by a small fraction of atoms in an interstitial configuration (Xi). Site interchange takes places with the aid of vacancies (V): Xi + V ⇌ Xs. Theoretical treatments of dissociative diffusion given in the literature deal with a virtually infinite foreign‐atom source producing a constant concentration at the boundary. Expressions of the dissociative diffusion coefficient and the corresponding solutions of Fick's second law are derived for finite source conditions under which all foreign atoms available get involved in the diffusion process. Copyright © 1990 WILEY‐VCH Verlag GmbH & Co. KGaA

引用

页码：107 / 115

页数：9

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