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By use of models given by Wagner and extended by Rapp et al., a layered structure is predicted for the reaction products resulting from the displacement reaction in diffusion couples (Ni-Cu2O or Co-Cu2O). Experiments at 1000°C confirm these predictions. However, when Cu2O is contaminated with chlorine, the morphology changes completely from a layered to an aggregate structure. It is shown that the resulting increase in layer thickness can be well described by assuming that the diffusion of oxygen through the Cu matrix is the rate-determining step. This behavior is compared with the phenomenon of internal oxidation of Cu-Ni alloys.

The influence of impurities on the kinetics and morphology of the displacement reaction between Ni or Co and Cu2O