On the mass dependence of the energy factor ΔK of the isotope effect for impurity diffusion in copper

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Abstract
Using diffusion and isotope effect measurements of Au and Co in Cu a lower limit of the correlation factor of impurity diffusion as well as the corresponding limits of the kinetic energy factor ΔK are calculated from Manning's jump frequency model of vacancies near impurity atoms. The results show that a variation in impurity mass by a factor of three does not change ΔK for impurity diffusion significantly. For Au and Co in Cu ΔK is found to be about the same as for self‐diffusion in copper. This result allows to estimate the jump frequency ratios and the corresponding vacancy flow factors.