It was found that the data could be described by:

D (cm2/s) = 1.0 x 10-1 exp[-33.0(kcal/mol)/RT]

P.L.Gruzin, Y.A.Polickarpov, G.B.Federov: Fizika Metallov i Metallovedenie, 1957, 4[1], 94-102