Thermal characterisation of chemically reduced electrolytic manganese dioxide
| Autor: | Liu, B, Thomas, PS, Williams, RP, Donne, SW |
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| Rok vydání: | 2005 |
| Předmět: | |
| Zdroj: | Journal of Thermal Analysis and Calorimetry. 80:625-629 |
| ISSN: | 1572-8943 1388-6150 |
| DOI: | 10.1007/s10973-005-0704-8 |
| Popis: | Samples of electrolytic manganese dioxide (EMD) were chemically reduced using 2-propanol under reflux (82°C) for 1, 2, 3, 6 and 24 h intervals. XRD analysis showed that the γ-MnO2 structure was preserved although the lattice dimensions were observed to increase with increasing degree of reduction to accommodate the intercalation of protons. The exception was the 24 h reduced sample which contained two phases; γ -MnO2 and γ -MnOOH. Three regions of decomposition in the range of 50 to 1000°C were observed using thermogravimetric analysis coupled with mass spectrometry (TG-MS) and were accounted for as water removal below 390°C, reduction of MnO2 to Mn2O3 between 400 and 600°C, and Mn2O3 to Mn3O4 between 600 and 1000°C. Again the exception proved to be the 24 h reduced sample which was observed to decompose predominantly in one step between 400 and 600°C directly to Mn3O4. © 2005 Akadémiai Kiadó Budapest. |
| Databáze: | OpenAIRE |
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