Reaction Kinetics, Mechanisms and Catalysis

, Volume 128, Issue 2, pp 809–829 | Cite as

A new facile synthesis, kinetic mechanism and some thermodynamic studies of thermal transformation of α-LiZnPO4·H2O

  • Nantawat Phonchan
  • Chanaiporn Danvirutai
  • Pittayagorn NoisongEmail author
  • Sujittra Youngme
  • Sira Sansuk


α-LiZnPO4·H2O was successfully synthesized via a new simple route in an aqueous media at ambient temperature. The as-prepared and the calcined powders were confirmed by standard characterization methods. The SEM micrographs of the title compound and its dehydration product were studied. The experimental enthalpy of dehydration was evaluated from DSC data, which was found to be close to the standard enthalpy of water vaporization. α-LiZnPO4·H2O dehydrates in a single step. Therefore, this compound is an additional ideal case for studying the decomposition kinetics. Non-isothermal dehydration kinetics was studied from TG data using Ozawa–Flynn–Wall (OFW) and Kissinger–Akahira–Sunose (KAS) methods including their iterative procedures, as well as some reliable solid-state kinetic equations of Coats–Redfern, Madhysudanan–Krishnan–Ninan (MKN), Tang and Wanjun. The most probable mechanism function was determined using the master plots method. The dehydration mechanism was found to be the chemical reaction with the one-third order reaction or the type F1/3 reaction model with the differential form of f(α) = 3/2 (1 − α)1/3 and the integral form of g(α) = 1 − (1 − α)2/3. The calculated activation energy value is exact and reliable. The discussions about the results of XRD, SEM, DSC, FTIR and the most probable mechanism function of dehydration are consistent.


α-LiZnPO4·H2Enthalpy of dehydration Kinetic mechanism The master plots method 



The authors would like to thank the Department of Chemistry and the Department of Physics (for XRD), Faculty of Science, Khon Kaen University, for providing the research facilities. The financial support from the Materials Chemistry Research Center, Department of Chemistry, and Center of Excellence for Innovation in Chemistry (PERCH-CIC), Faculty of Science, Khon Kaen University.

Supplementary material

11144_2019_1652_MOESM1_ESM.docx (705 kb)
Supplementary material 1 (DOCX 705 kb)


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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  • Nantawat Phonchan
    • 1
  • Chanaiporn Danvirutai
    • 1
  • Pittayagorn Noisong
    • 1
    Email author
  • Sujittra Youngme
    • 1
  • Sira Sansuk
    • 1
  1. 1.Department of Chemistry and Center of Excellence for Innovation in Chemistry (PERCH-CIC), Faculty of Science, Materials Chemistry Research CenterKhon Kaen UniversityKhon KaenThailand

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