Concentration dependent diffusion coefficients for 45Ca2+ in purified KCl were measured using a sectioning method. Isothermal diffusion annealing was performed at 451 to 669C. Above 580C, diffusion occurred from a vapor source. Below 580C, surface-deposited sources were used. The saturation diffusion coefficients were given by:

D(cm2/s) = 9.93 x 10-5 exp[-0.592(eV)/kT]

H.Machida, W.J.Fredericks: Journal of Physics and Chemistry of Solids, 1978, 39[7], 797-805