It was found that 35S diffusion data for 5N-purity samples at 800 to 1000C, could be described by:

D (cm2/s) = 2.3 x 101 exp[-2.14(eV)/kT]

F.Moya, G.E.Moya-Gontier, F.Cabane-Brouty: Physica Status Solidi, 1969, 35[2], 893-901