The diffusive behavior of 59Fe in 5N-purity single crystals was studied at 550 to 636C. The results could be described by:

D (cm2/s) = 1.35 x 102 exp[-46.0(kcal/mol)/RT]

W.B.Alexander, L.M.Slifkin: Physical Review B, 1970, 1[8], 3274-82