The diffusivity of Ni in γ-Fe was determined at 1133 to 1287C by using the residual-activity counting method. The results could be described by:

D (cm2/s) = 1.09 x 108 exp[-70.7(kcal/mol)/RT]

Y.Hanatate, K.Majima, H.Mitani: Transactions of the Japan Institute of Metals, 1978, 19[12], 669-73