| Autor: |
Tinsley, D. M., Sharp, J. H. |
| Zdroj: |
Journal of Thermal Analysis and Calorimetry; March 1971, Vol. 3 Issue: 1 p43-48, 6p |
| Abstrakt: |
TG and DTA curves ofγ-MnO2 have been obtained in nitrogen, air and oxygen. The reactions MnO2→Mn2O3 and Mn2O3→ Mn3O4 were observed in the ranges 450° to 600° and 750° to 1100° respectively, and the decomposition temperatures are affected by the partial pressure of oxygen. The endotherm at ∼1200° is unaffected by the atmosphere and is not accompanied by weight loss. It is, therefore, due to a polymorphic transformation of Mn3O4 rather than formation of MnO. Reaction to form MnO was observed by TG in nitrogen above 1400°, but did not occur on heating in oxygen to 1500°. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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