The bulk diffusivity of 64Cu was studied at 700 to 850C. On the basis of the results, it was proposed that the diffusivity could be described by:

D (cm2/s) = 5.9 x 100 exp[-59.0(kcal/mol)/RT]

V.A.Lazarev, V.M.Golikov: Fizika Metallov i Metallovedenie, 1970, 29[3], 598-602