Journal of Thermal Analysis and Calorimetry

, Volume 113, Issue 2, pp 649–657 | Cite as

Application of simplified version of advanced isoconversional procedure in non-isothermal kinetic study

Thermal decomposition of NH4Co0.9Zn0.1PO4·H2O
  • Zhipeng Chen
  • Qian Chai
  • Sen Liao
  • Yu He
  • Yu Li
  • Wenwei Wu
  • Bin Li


The single phase NH4Co0.9Zn0.1PO4·H2O was prepared via solid-state reaction at 80 °C. Based on a simplified version of advanced isoconversional procedure, the values of activation energy E α associated with the first, second, and third stages of the thermal decomposition of NH4Co0.9Zn0.1PO4·H2O were obtained, which demonstrates that the third stage is a kinetically complex process, and the first and second stages are single-step kinetic processes and can be described by a unique kinetic triplet [E α, A, and g(α)]. The most probable reaction mechanisms of the first two stages were estimated by the comparison between experimental plots and modeled results. The values of pre-exponential factor A of the two stages were obtained on the basis of E α and the reaction mechanisms. The distributed activation energy model was applied to study the third stage. Besides, some thermodynamic functions of transition state complexes (ΔS , ΔH , and ΔG ) of the two stages were also calculated.


NH4Co0.9Zn0.1PO4·H2Non-isothermal kinetics Thermodynamics Thermal decomposition Thermogravimetric analysis Solid-state reaction 



This study was financially supported by the Key laboratory of new processing technology for nonferrous metals and materials, Ministry of Education, Guangxi University (No. GXKFZ-02); the Guangxi Natural Scientific Foundation of China (Grant Nos. 2012GXNSFAA053019 and 0991108); and the Guangxi Science and Technology Agency Research Item of China (Grant No. 0895002–9).

Supplementary material

10973_2012_2714_MOESM1_ESM.doc (3 mb)
Supplementary material 1 (DOC 3060 kb)


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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2012

Authors and Affiliations

  • Zhipeng Chen
    • 1
  • Qian Chai
    • 1
  • Sen Liao
    • 1
  • Yu He
    • 1
  • Yu Li
    • 1
  • Wenwei Wu
    • 1
  • Bin Li
    • 1
  1. 1.School of Chemistry and Chemical EngineeringGuangxi UniversityNanningChina

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