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

D (cm2/s) = 9.2 x 101 exp[-72.0(kcal/mol)/RT]

V.A.Lazarev, V.M.Golikov: Fizika Metallov i Metallovedenie, 1971, 31[4], 885-6