Abstract
The motion of cation tracers in binary transition metal oxides which are exposed to an oxygen potential gradient is analyzed. Tracer self-diffusion as well as tracer impurity diffusion is studied and both cation vacancies and interstitial cations are considered as deffects in the oxide. The oxygen potential gradient induces a directed flux of these defects which again causes a drift flux of the tracer ions. The direction of this drift flux which is above and beyond the normal Brownian motion depends on the interaction between tracer ions and defects. For weak interaction the tracer drift flux is in the opposite direction of the defect flux if vacancies dominate, while it is in the same direction if interstitials dominate. In contrast, the tracer ions drift with the defects in the case of strong interaction between them. Experiments with cobalt oxide (CoO) and magnetite (Fe 3O 4) as solvent oxides and 60Co and 59Fe as tracer ions are discussed.
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