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two kinds of experiments are commonly used to study 852 diffusion-limited oxidation/reduction kinetics: oxygen self-diffusion and chemical diffusion 853 (redox) experiments. By " chemical diffusion experiments " , we consider experiments that let the 854 sample equilibrate with a change in the gaseous atmosphere. The diffusing species, depending on 855 the authors, are oxygen or cations or both (this study) By " oxygen self-diffusion experiments, 856 we consider experiments (mainly isotopic) that study the tracer (or network) diffusion of oxygen, p.857, 1996. ,