Y. Kuz'minskii, A. A. Andriiko, L. Nyrkova
Nov 1, 1994
Citations
0
Influential Citations
9
Citations
Journal
Journal of Power Sources
Abstract
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.