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Journal of Thermal Analysis and Calorimetry

, Volume 80, Issue 3, pp 625–629 | Cite as

Thermal characterisation of chemically reduced electrolytic manganese dioxide

  • B. Liu
  • P. S. Thomas
  • R. P. Williams
  • S. W. Donne
Article

Summary

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.

reduction TG-MS X-ray crystallography electrolytic manganese dioxide 

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Copyright information

© Springer-Verlag/Akadémiai Kiadó 2005

Authors and Affiliations

  • B. Liu
    • 1
  • P. S. Thomas
    • 2
  • R. P. Williams
    • 3
  • S. W. Donne
    • 4
  1. 1.Department of Chemistry, Materials and Forensic Sciences, University of Technology
  2. 2.Department of Chemistry, Materials and Forensic Sciences, University of Technology
  3. 3.Delta-EMD Australia Pty Limited
  4. 4.Discipline of Chemistry, University of Newcastle

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