INFLUENCE OF THE KINETIC DEMIXING OF CATIONS ON CERAMIC AGING AND ALLOY CORROSION

This paper concerns the kinetic demixing of cations in semiconducting oxides. From the general equations of matter transport, time-dependent cation redistributions are given for (Co, Mg)O and (Fe, Cr)O solid so lutions for which thermodynamical and kinetic data are available. The cation kinetic demixing effects on the reaction rates are described. T he conclusions are used to analyse the behavior of (Fe, Cr)O solid sol utions under a chemical potential gradient and the effect of Cr on the internal oxidation of Ni-Cr alloys.