Journal
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
Volume 99, Issue 1, Pages 357-362Publisher
SPRINGER
DOI: 10.1007/s10973-009-0096-2
Keywords
Serrabrancaite; MnPO4; H2O; Non-isothermal kinetics; Thermogravimetry
Funding
- Thailand Research Fund (TRF)
- Commission on Higher Education (CHE) [MRG5280073]
- Ministry of Science and Technology, Thailand
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The thermal decomposition of synthetic serrabrancaite (MnPO4 center dot A H2O) was studied in N-2 atmosphere using TG-DTG-DTA. Thermal analysis results indicate that the decomposition occurs in two stages, which are assigned to the dehydration and the reduction processes and the final product is Mn2P2O7. X-ray powder diffraction, FT-IR and FT-Raman techniques were used for identification of the solid decomposition product. The decomposition kinetics analysis of MnPO4 center dot A H2O was performed under non-isothermal condition through isoconversional methods of Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS). The dependences of activation energies on the extent of conversions are observed in the dehydration and the reduction reactions, which could be concluded the multi-step processes.
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