A combined study was made of 204Tl tracer diffusion and inelastic neutron scattering. It was recalled that, in contrast to the self-diffusion behavior of body-centered cubic alkali and transition metals (which were characterized by non-linear Arrhenius plots), self-diffusion in -Tl had not yet been clearly classified as being normal or anomalous. This was because of the small temperature range of existence of the body-centered cubic phase. Alloying with the homologous element, In, markedly extended this range. The vacancy migration enthalpy was calculated here on the basis of phonon dispersion measurements. It was found to be temperature-independent. This was consistent with the perfectly straight Arrhenius plots for self-diffusion in the present body-centered cubic alloy. The diffusion behavior was here classified as being normal.

P.Knorr, F.Güthoff, C.Herzig: Physica Status Solidi A, 1995, 151[1], 47-59