A theory of diffusion in the Ll(2) structure .1. Tracer correlation effects

被引：17
|
作者：
Belova, IV [1 ]
Murch, GE [1 ]
机构：
[1] UNIV NEWCASTLE,DEPT MECH ENGN,CALLAGHAN,NSW 2308,AUSTRALIA
来源：
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 1997年 / 58卷 / 02期
基金：
澳大利亚研究理事会;
关键词：
alloys; intermetallic compounds; diffusion; defects; thermodynamic properties;
D O I：
10.1016/S0022-3697(96)00129-1
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
In this study a six frequency model for describing diffusion in binary A(3)B ordered alloys taking the L1(2) structure is proposed. The model supposes that the sublattices exist a priori. Three vacancy exchange frequencies describe A jumps from the alpha sublattice to the beta sublattice and its reverse, and intra alpha sublattice jumps. Another three exchange frequencies describe B jumps from the beta sublattices to the alpha sublattice and its reverse, and again intra alpha sublattice jumps. Explicit expressions are derived for the tracer correlation factors. Computer simulation results are used to assess the analysis. There is generally good agreement. (C) 1997 Elsevier Science Ltd. All rights reserved.
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页码：301 / 309
页数：9
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