Journal
PHYSICA B-CONDENSED MATTER
Volume 405, Issue 9, Pages 2350-2355Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physb.2010.02.046
Keywords
Inorganic compounds; Thermogravimetric analysis (TGA); Non-isothermal kinetics; Thermodynamic properties
Categories
Funding
- Thailand Research Fund (TRF)
- Commission on Higher Education (CHE)
- Ministry of Education, Thailand
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The thermal decomposition kinetics of FePO4 center dot 2H(2)O in dynamical air atmosphere was studied by mean TG-DTG-DTA. The stage and product of the thermal decomposition were determined. A number of kinetic models and calculation procedures were used to determine the kinetic triplet and thermodynamic parameters characterizing the dehydration process. The obtained activation energy and most kinetic model indicate the single kinetic mechanism and three-dimension diffusion as Ginstling-Brounstein equation (D4 model), respectively. The thermodynamic functions (Delta H*. Delta G* and Delta S*) of the dehydration reaction are calculated by the activated complex theory and indicate that the process is non-spontaneous without connecting with the introduction of heat. The kinetic and thermodynamic results were satisfactory which present good correlation with a linear correlation coefficient close to unit a low standard deviation. (C) 2010 Elsevier B.V. All rights reserved.
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