The diffusive behavior of Cu was studied at 450 to 750C. The results could be described by:

D (cm2/s) = 6.0 x 10-2 exp[-0.98(eV)/kT]

V.S.Vasilev, I.N.Kanevskii, V.B.Osvenskii: Fizika i Tekhnika Poluprovodnikov, 1968, 2[12], 1795-9