Diffusion in melt with nonstationary interphase boundary

This work deals with the diffusion in a melt which is in contact with a solid. Due to the dissolution and diffusion of the solid in the melt the interphase boundary moves. The mathematical description leads to the solution of the diffusion equation, the constant Dirichlet boundary condition of which is defined on the non-stationary interphase boundary of the diffusion field. The problem is solved by means of the thermal potential of a double layer. The values of diffusion coefficients obtained from experimental data according to this theory are smaller than in the case where the movement of the interphase boundary is not taken into account.