Impurity Diffusion in F.C.C. Metals

A new model of the impurity diffusion in f.c.c. metals is described. A relation for the difference of the vacancy migration energies Δ H M □ of the impurity atom and the matrix atom is developed: T m and T are the melting temperatures of the matrix and the foreign metal and H M □ is the vacancy migration energy in the matrix metal. – Δ H M □, the binding energy between impurity and vacancy is calculated from the different jump frequencies of a matrix atom in the neighbourhood of the impurity atom: Δ H M □ = 0.17 Δ H M □ The temperature dependence of the correlation factor is determined from the calculated jump frequencies using Le Claire's approximation method.