The diffusion of Ni was studied at 1000 to 1200C. The results could be described by:

D (cm2/s) = 3.0 x 10-3 exp[-8.7(kcal/mol)/RT]

N.Sano, S.Honma, Y.Matsushita: Metallurgical Transactions, 1970, 1[1], 301-3