The diffusion of Ce ions in KC1 crystals was studied at 500 to 700C by diffusion from a radioactively tagged deposit of CeCl3 and use of a sectioning technique. The diffusion showed no apparent dependence upon concentration. The diffusion coefficient obeyed the equation:

D(cm2/s) = 1.12 x 10-3 exp[-23700/RT]

F.J.Keneshea, W.J.Fredericks: Journal of Physics and Chemistry of Solids, 1965, 26[12], 1787-94