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- W2363960721 abstract "Abstract The interaction between potassium and manganese oxides was studied using DTA, TG, DTG and X-ray diffraction techniques. The results obtained revealed that potassium-treatment of MnCO3 enhanced its thermal decomposition and underwent solid-solid interaction with the manganese oxides produced yielding potassium manganates. All the diffraction lines of KMn8O16 were only detected in the X-ray diffraction patterns of MnCO3 treated with 15 mol% KOH heated in air at 400°C. This compound resulted from the interaction between KOH and Mn2O3. The heating of the mixed oxide-solids at 750°C increased the crystallinity of the manganate phase with subsequent appearance of well-crystalline partidgeite Mn2O3 phase. Increasing the calcination temperature to 900°C led to the formation of well-crystalline KMnO2 phase together with well-crystalline Mn3O4 and KMn8O16 phases. KMnO2 was produced via solid-solid interaction between K2O and Mn2O3 and/or Mn3O4. The potassium manganates formed remained thermally stable to temperatures above 1000°C then decomposed at 1100°C yielding Mn3O4 and K2O. The potassium-treatment of manganese carbonate was found to decrease the decomposition temperature of MnCO3, MnO2 and Mn2O3 to an extent proportional to the amount of KOH added. The thermal dissolution of K+ ions in the lattices of manganese oxides was too difficult due to the big difference between the ionic radii (r) of K+ and manganese ions (r of K+ ion is almost twice that of the ions of manganese oxides). The observed effect of K+ ions on the thermal stability of manganese carbonate and manganese oxides was attributed to the chemical affinity of K+ ions to interact with manganese oxides yielding potassium manganates." @default.
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- W2363960721 date "1986-06-01" @default.
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- W2363960721 title "Thermal solid—solid interaction between sodium and manganese oxides" @default.
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- W2363960721 doi "https://doi.org/10.1016/0040-6031(86)80054-5" @default.
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