Concentration-dependent diffusion coefficients for 45Ca2+ in ion-exchanged NaCl were determined by using a sectioning method. Isothermal diffusion annealing was performed at 448 to 683C. The diffusion data could be described by:

D (cm2/s) = 1.14 x 10-3 exp[-0.85(eV)/kT]

H.Machida, W.J.Fredericks: Journal de Physique - Colloques, 1976, 7, 385-91