A survey was made of 12 final relationships for diffusion characteristics, as deduced from experimental data by assuming interphase boundary movement according to the parabolic law. The determination of diffusivities could be performed by using 4 methods which exploited a knowledge of the area below concentration curves, and a knowledge of the concentration gradients at the interphase boundary. The resultant relationships were applied to the evaluation of Al diffusion, in the Ni3Al/Ni system at 1100C, on the basis of published data. The calculated diffusivity values generally exhibited a smaller dispersion than did the values which were obtained by using the Matano-Boltzmann method. It was concluded that these new procedures for diffusivity evaluation could be used advantageously when the concentration dependence of the diffusivity was slight.

Evaluation of Experimental Data on Diffusion in Semi-Infinite Two-Phase Systems with Non-Stationary Interphase Boundary by Means of Thermal Potentials - Application of the Theory to Diffusion Characteristics Determination. P.Kubicek: Czechoslovak Journal of Physics, 1999, 49[12], 1669-84