Precision Monte Carlo simulations of labeled particle diffusion in mixed A-B alloys in two and three dimensions are reported. A variety of concentrations and ratios of the hopping rates JB/JA={η} are analyzed. Results are compared with those predicted by available theories. The validity of these theories is observed to be strictly limited to the region where {η}>1/z (z is the lattice coordination number).
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El-Meshad et al. (1985) studied this question.
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