It was found that the data for 35S in the α-phase , at 870 to 1080K, could be described by:

without polymorphic transformation:    D (cm2/s) = 8.9 x 100 exp[-44.2(kcal/mol)/RT]

with polymorphic transformation:    D (cm2/s) = 3.1 x 100 exp[-41.1(kcal/mol)/RT]

B.A.Vandyshev, A.S.Panov, P.L.Gruzin: Fizika Metallov i Metallovedenie, 1967, 23[5], 908-12