Oxidation of wustite-type solid solutions (A, B)O and reduction of sesquioxide solid solutions (A, B)*03 can lead to the precipitation of a spinel phase (A, B)304 at an inner reaction front. A representation of the reaction scheme and kinetics for each of the two cases will be given. Observations on the macroscopic morphology of the spinel precipitates and on the structure of the precipitatehatrix interphase boundary are discussed.
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