The diffusion of 64Cu in γ-phase material was studied at temperatures of between 170 and 340C. It was found (table 18) that the tracer diffusion coefficient was larger, by a factor of 5 at 170C and by a factor of 2 at 340C, than the diffusivity which was calculated from the ionic conductivity. The Arrhenius plots of both quantities were curved, but the difference between them was linear and corresponded to the diffusion coefficient which was deduced from nuclear magnetic resonance data. On the basis of the differences between these 3 diffusion coefficients, it was concluded that Cu+ atomic transport took place largely via associated pairs of interstitial Cu+ ions and cation vacancies.

H.P.Schäfgen, H.Richtering: Berichte der Bunsengesellschaft für Physikalische Chemie, 1984, 88[4], 401-5

Table 18

Diffusivity of 64Cu in CuBr