It was found that the data for Ni diffusion on thin films at 500 to 850C could be described by:

D (cm2/s) = 2.5 x 10-2 exp[-26.0(kcal/mol)/RT]

B.Y.Pines, I.P.Grebennik, I.V.Gektina: Fizika Metallov i Metallovedenie, 1970, 30[6], 1320-2