By using the serial sectioning technique, a study was made of the diffusion of 45Ca ions in high-purity single crystals. It was found that the data, at 500 to 730C, could be described by:

D (cm2/s) = 9.4 x 10-4 exp[-1.14(eV)/kT]

F.Bénière, M.Bénière, M.Chemla: Comptes Rendus de l’Academie des Sciences – C, 1969, 268[17], 1461-4