The diffusion of Cu was studied at 700 to 1000C. The results could be described by:

D (cm2/s) = 5.0 x 10-1 exp[-56.5(kcal/mol)/RT]

B.Y.Pines, I.G.Ivanov, I.V.Smushkov: Soviet Physics – Solid State, 1963, 4, 7