Abstract

By physicochemical methods (XRD, SEM, TEM, TGA, Mossbauer spectroscopy, magnetization measurements), the conditions (temperature, pO2, structure) of oxidation and reduction by the internal solid-phase mechanism in the spinel composite oxides NixMn1 − xFe2O4 and ZnxMn1 − xFe2O4 are established; the correlation between reactions kinetics (and mechanism) and the distribution of cations of different charges by structural positions is shown.

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