The self-diffusion of 64Cu single crystals was measured, by using serial sectioning methods, at 737 to 1079C. The results could be described by:

D (cm2/s) = 1.3 x 10-1 exp[-47.4(kcal/mol)/RT]

and

D (cm2/s) = 4.6 x 100 exp[-57(kcal/mol)/RT]

assuming a mono-vacancy and a divacancy mechanism, respectively.

D.Bartdorff, G.Neumann, P.Reimers: Philosophical Magazine, 1978, 38[2], 157-65