It was found that the data for 1222 to 1528C could be described by:

γ-Fe:     D (cm2/s) = 2.9 x 10-3 exp[-7.68(kcal/g-atom)/RT]

δ-Fe:     D (cm2/s) = 2.88 x 10-1 exp[-22.35(kcal/g-atom)/RT]

H.Schenck, K.W.Lange: Archiv für Eisenhüttenwesen, 1966, 37[10], 809-12