Correlation factors, as obtained from the ratio of the tracer diffusion coefficients in the binary random alloy model, were compared with the correlation factors which were obtained from isotope-effect measurements. To this end, the Manning and Moleko-Allnatt theories were examined in detail. It was shown that, for both atomic components, Manning's theory (in which both types of correlation factor were automatically equal) furnished a reasonable agreement with Monte Carlo data only when the tracer diffusion coefficients were within a factor of 2. On the other hand, the Moleko-Allnatt theory gave excellent agreement for both correlation factors; for a very wide range of diffusion coefficient ratios. Some of the differences in the above formalisms were considered for the Fe-Co and Cu-Zn systems.

Tracer Diffusion and the Isotope Effect in the Binary Random Alloy. G.E.Murch, I.V.Belova: Philosophical Magazine A, 2000, 80[10], 2365-73