Delineation of the Problem of Soret Diffusion

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Abstract
The phenomenological heat of transport is analyzed for the simple cases of self-diffusion via a vacancy mechanism and of diffusion of solutes in interstitial solid solutions. The heat of transport is shown to be equal to the sum of an energy-conversion term and an energy-transport term. The latter is a function of the details of the mechanism and is of kinetic character; a positive contribution is made to it by the localized normal modes about a solute atom. The energy-conversion term has a thermodynamic character once the diffusion mechanism is specified, and by its use one can decompose energies of solution or of vaporization into a part associated with the solute atom and another part associated with the solvent lattice.

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