It was found that the data for samples containing 0.01 to 0.9%S, at 1100 to 1300C, could be described by:

D (cm2/s) = 2.0 x 10-2 exp[-14.5(kcal/mol)/RT]

T.Ejima, N.Inagaki, M.Kameda: Transactions of the Japan Institute of Metals, 1966, 7, 133-42