Thermomigration in alloys for which substitutional-vacancy and interstitial-vacancy mechanisms are operative

Abstract

The theoretical treatments of alloy diffusion in a temperature gradient by the substitutional-vaoanoy mechanism and by the interstitial-vacancy mechanism have been combined, and two types of thermomigration experiments which differ in initial condition have been analysed. It is shown that these experiments, as for measurements of the impurity heat of transport, are apparently incapable of distinguishing between the two mechanisms of diffusion. However, an expression for the lattice velocity in such a combined state alloy is developed and will distinguish between the two mechanisms in a rather specific fashion.