It was found that the data for 748 to 1192C, could be described by:

D (cm2/s) = 7.5 x 10-1 exp[-64.7(kcal/mol)/RT]

K.Hirano, R.P.Agarwala, B.L.Averbach, M.Cohen: Journal of Applied Physics, 1962, 33, 3049-54