The diffusion of Zn in single crystals of α-type material, with 0 to 12at%Zn, was studied (table 205) at between 848 and 1169K. At temperatures greater than 1068K, the tracer diffusion coefficients could be described by Arrhenius curves. At lower temperatures, the diffusion coefficients decreased to below the extrapolated high-temperature Arrhenius line. The deviation began at a temperature which was about 25K higher than the Curie

temperature. At below 1068K, the experimental results agreed closely with the predictions of the Borg theory. At temperatures close to the Curie point, no decrease in the diffusion coefficients was found as the Zn content decreased towards zero.

I.Richter, M.Feller-Kniepmeier: Physica Status Solidi A, 1981, 68[1], 289-300