Thermal Stability and Oxidation of Mn3O4

Grasselly, Gyula (1972) Thermal Stability and Oxidation of Mn3O4. ACTA MINERALOGICA PETROGRAPHICA, 20 (2). pp. 227-240. ISSN 0365-8066

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Abstract

On the basis of thermal, X-ray, and infra-red investigations, it was found that Mn3 04 heated in air within the thermal stability range of MnsO, will be slowly oxidized to a-Mn2 03 if it is pure; however, oxidation will be initiated and accelerated by the presence of other manganese oxides and also by ferric oxide. If the possibility of oxidation is excluded, as in N2 or C0 2 atmosphere, the Mn3 04 remains unchanged during prolonged heating in the temperature range cited above. However, Mn,Os heated in a C0 2 atmosphere in its own thermal stability range will be decomposed into Mn3 04 and even more MnO appears as a new phase. These experimental facts presumably may be used in interpreting the formation of manganese oxide assemblages in different metamorphic processes.

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