Abstract
The frequency-dependent phenomenological coefficients for the atomic transport by the vacancy mechanism in a simple cubic binary random alloy with a very small vacancy content have been calculated through the kinetic equation approach. The contribution of the three-site terms (second order in fluctuations of the atomic occupancy variables) has been obtained by neglecting terms of the third order in these fluctuations in the kinetic equation. The results for the generalized transport coefficients are compared with the computer simulation results and a self-consistent approximation used earlier for the three-site terms. Compared with the self-consistent approximation our results are less accurate for the tracer and non-tracer correlation factors but show better agreement for the frequency-dependent conductivity when compared with the simulation results for the highest-to-lowest-jump-frequency ratio of ten.
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