Experimental data on 6Li and 7Li diffusivities, as determined by Feinauer et alia were explained within the framework of a theory developed by Omini. The scattering processes responsible for diffusion were described in terms of a Fourier-transformable pair potential through which the diffusing atom interacted with the atoms of the surrounding liquid. Two main improvements were introduced into the theory with respect to its original formulation: the first was represented by a more reliable form of trial function in the variational procedure used to solve the transport equation; the second consisted of a re-interpretation of the long wavelength part of the potential, i.e. the part connected with collective modes of vibration. The theory provided an explanation of the dynamic isotope effects observed in self-diffusion and inter-diffusion coefficients.

Self-Diffusion and Interdiffusion Coefficients of Liquid Lithium Isotopes. M.Omini: Philosophical Magazine, 2006, 86[12], 1643-66

Table 6

Diffusion of 65Zn in Mg-Al Alloys

a: serial sectioning, b: residual activity

   continued

Table 6 (continued)

Diffusion of 65Zn in Mg-Al Alloys

a: serial sectioning, b: residual activity