Abstract
The Miedema-Niessen model for the volume effects which occur when two transition metals are alloyed is applied to the fast diffusion of metallic impurities in metals. The use of the model is also extended to other metallic systems. A correlation is found between fast diffusivities and the volumes corrected using this model. A similar correlation is found for the activation volumes for the diffusion of impurities in lead. The difference in the diffusion behaviour of gold and silver, which have equal uncorrected volumes, can be explained. It can be understood why gold is a fast diffuser in lead, praseodymium, thallium, indium and zinc, but not in γ-U although other impurities are fast diffusers in this metal. Predictions are made for other fast-diffusing systems.
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