The diffusive behavior of Ni was studied in 5N-purity material at 990 to 1220C. The results could be described by:

D (cm2/s) = 2.63 x 10-3 exp[-7.3(kcal/mol)/RT]

H.Rickert, A.A.El Miligy: Zeitschrift für Metallkunde, 1968, 59[8], 635-41