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A THEORY OF DIFFUSION IN THE L12STRUCTURE.:I: TRACER CORRELATION EFFECTS

Authors
Journal
Journal of Physics and Chemistry of Solids
0022-3697
Publisher
Elsevier
Publication Date
Volume
58
Issue
2
Identifiers
DOI: 10.1016/s0022-3697(96)00129-1
Keywords
  • A. Alloys
  • A. Intermetallic Compounds
  • D. Diffusion
  • D. Defects
  • D. Thermodynamic Properties

Abstract

Abstract In this study a six frequency model for describing diffusion in binary A 3B 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 α sublattice to the β sublattice and its reverse, and intra α sublattice jumps. Another three exchange frequencies describe B jumps from the β sublattices to the α sublattice and its reverse, and again intra α 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. © 1997 Elsevier Science Ltd. All rights reserved

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