It was found that S diffusion data for 5N-purity foils at 900 to 1000C, could be described by:

D (cm2/s) = 6.0 x 10-1 exp[-39.2(kcal/mol)/RT]

S.J.Wang, H.J.Grabke: Zeitschrift für Metallkunde, 1970, 61[8], 597-603