The diffusion of tin in lead

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Abstract
The diffusion of tin in lead has been studied in the temperature range 195–322[ddot]C by the resistometric method. An Arrhenius relation is found to be obeyed. The values of activation energy and diffusion coefficient agree well with the earlier values determined by the radioactive tracer technique. An attempt has been made to interpret the data in the light of pseudo-potential theory using two different potentials and different exchange and correlation functions. The effect of exchange and correlation have been incorporated and the effect of relaxation of the neighbours at the activated position of the impurity atom during migration was taken into account. The calculated value of ΔQ, namely the difference between the activation energies of impurity and self-diffusion, seems to depend on the form of potential and exchange correlation chosen although the sign of ΔQ is reproduced in all cases.