The serial sectioning technique was used to study the diffusion of 35SO42- ions in single crystals, in the intrinsic range. The results could be described by:

D (cm2/s) = 0.065 exp[-1.12(eV)/kT]

M.Bénière, F.Bénière, M.Chemla: Solid State Communications, 1973, 13[9], 1339-43