The capillary reservoir method was used to study the volume diffusion of 64Cu at 1100 to 1300C. The results were described by:

D (cm2/s) = 1.22 x 10-3 exp[-10.0(kcal/g-atom)/RT]

T.Yamamura, T.Ejima: Journal of the Japan Institute of Metals, 1973, 37[8], 901-7