Frequency-dependent phenomenological coefficients were calculated, using the kinetic equation approach, for atomic transport via the vacancy mechanism in a simple-cubic binary random alloy with a very low vacancy content. The contribution of 3-site terms (second-order in fluctuations of the atomic occupancy) was obtained by neglecting terms of the third order in the fluctuations. The results for the generalized transport coefficients were compared with computer simulation results and with a self-consistent approximation for the 3-site terms. When compared with the self-consistent approximation, the results were less accurate for the tracer and non-tracer correlation factors.

Atomic Transport Coefficients in a Binary Random Alloy. S.Sharma, R.Singh, D.K.Chaturvedi: Philosophical Magazine A, 1999, 79[11], 2803-14