DSC
characterisation of chemically reduced electrolytic manganese dioxide |
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| Authors: | B?Liu Email author" target="_blank">P?S?ThomasEmail author A?S?Ray R?P?Williams S?W?Donne |
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| Institution: | (1) Department of Chemistry, Materials and Forensic Sciences, University of Technology Sydney, Sydney, Australia, NSW 2007, PO Box 123, Broadway;(2) Delta-EMD Australia Pty Limited, Mayfield West, Australia, 2304, McIntosh Drive;(3) Discipline of Chemistry, University of Newcastle, Callaghan, Australia, NSW 2308 |
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| Abstract: | The thermal decomposition of electrolytic
manganese dioxide (EMD), in an inert atmosphere, and the effect of chemical
reduction on EMD, using 2-propanol under reflux (82°C), was investigated
by differential scanning calorimetry (DSC). This study is an extension of
a study investigating the thermal decomposition of EMD and reduced EMD by
TG-MS (J. Therm. Anal. Cal., 80 (2005)625)). The DSC characterisation was
carried out up to 600°C encompassing the water loss region up to 390°C
and the first thermal reduction step. Water removal was observed in two distinct
endothermic peaks (which were not deconvolved in the TG-MS) associated with
the removal of bound water. For the lower degrees of chemical reduction, thermal
reduction resulted in the formation of Mn2O3;
for higher degrees of chemical reduction, the thermal reduction resulted in
Mn3O4 at 600°C. In the DSC
the thermal reduction of the EMD and chemically reduced specimen was observed
to be endothermic. The reduced specimens, however, also showed an exothermic
structural reorganisation. |
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| Keywords: | chemical reduction DSC electrolytic manganese dioxide |
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