Add time:09/08/2019 Source:sciencedirect.com
Chemical and phase composition of manganese oxides obtained by Mn(II) oxidation in nitrate solutions has been studied by the methods of differential thermal analysis, IR spectroscopy, X-ray phase and chemical analyses. The product of Mn(II) oxidation with nitrate has been shown to be a partially hydrated oxide of the MnO2−n composition, 0.2 < n < 0.4. It has been found that the average degree of oxidation of manganese is affected by conditions of the synthesis: it increases with decreasing nitrate concentration and temperature. Treatment of the product with diluted nitric acid leads to a disproportionation of underoxidized Mn(III) compounds into Mn(II) and Mn(IV). The final product is γ-MnO2.
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