Non-Arrthenius Behaviour and Divacancy Contribution in Self-Diffusion of 64Cu in Cu

The self-diffusion of ⁶⁴Cu in Cu was investigated in the high temperature range (1078 to 1348 K), applying the tracer-standard sectioning technique. For the frequency factor D₀ and the activation energy Q₀ we found D₀ = (0.68)cm² · s⁻¹ and Q₀ = (2.17 ± 0.02) eV. A slight bending of the Arrhenius plot suggests a divacancy contribution to the self-diffusion of copper. Data sets used in an numerical analysis are in good accord with published results.