Journal of Thermal Analysis and Calorimetry

, Volume 134, Issue 3, pp 1575–1587 | Cite as

Determination of thermokinetic parameters and thermodynamic functions from thermoforming of LiMnPO4

  • Chuchai SronsriEmail author
  • Banjong BoonchomEmail author


This article presents the determination of thermokinetic parameters and thermodynamic functions from the thermoforming of LiMnPO4. In our previous paper, a couple of thermoreaction processes, e.g., co-elimination and polycondensation of thermokinetics and thermodynamics, were incompletely determined. The co-elimination process is considered as dehydration and a deammoniation process in this paper. Evidently, an alternative technique was applied for calculating the extent of conversion values using the ratio of the peak area of the deconvoluted DTG peak after applying the Fraser–Suzuki deconvolution. An iterative equation of the integral isoconversional technique was used to estimate the reliable activation energy Eα. Each separated peak, including dehydration, deammoniation, and polycondensation, was obviously evaluated as a single kinetic process with its own kinetic parameters. In order to choose reliable mechanisms, the y(α) master plots or the plots between the experiment and the model were compared. The plots thus obtained showed that the dehydration, deammoniation, and polycondensation processes were found to be 3/2-order chemical reaction (F3/2), 2-order chemical reaction (F2), and nucleation (P3/2) mechanisms, respectively. The pre-exponential factor values were obtained from Eα, and the reaction mechanisms were found to be 3.78 × 1012, 7.05 × 1012, and 1.96 × 1013 s−1, respectively. The evaluated thermodynamic data of the activated complexes showed that the thermal reaction required thermal energy to complete the reaction.


Thermokinetic and thermodynamic data Alternative technique Fraser–Suzuki deconvolution Integral isoconversional technique Master plot 



This work is supported by King Mongkut’s Institute of Technology Ladkrabang (KREF146001). I would like to thank the Advanced Phosphate Materials and Alternative Fuel Energy Research Unit, Department of Chemistry, Faculty of Science, King Mongkut’s Institute of Technology Ladkrabang, Thailand. I also thank Assoc. Prof. Dr. Chanaiporn Danvirutai for carefully reading the manuscript.


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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  1. 1.Advanced Phosphate Materials and Alternative Fuel Energy Research Unit, Department of Chemistry, Faculty of ScienceKing Mongkut’s Institute of Technology LadkrabangBangkokThailand

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