Abstract
Simple direct precipitation was used to synthesize the single-phase Mn0.9Co0.1HPO4·3H2O compound. Two thermal decomposition steps were observed corresponding to the dehydration and polycondensation processes, respectively. The pure-phase Mn1.8Co0.2P2O7 compound was obtained as the final decomposition product. The thermogravimetry/differential thermogravimetry/differential thermal analysis, Fourier transform infrared, atomic absorption spectrophotometry, X-ray diffraction and scanning electron microscope techniques were used to characterize the synthesized compounds. The iterative Kissinger–Akahira–Sunose method was carried out to calculate the exact activation energy \(E_{\alpha }\) values. The first (overlapping between Regions I and II) and the final steps were confirmed to be single-step kinetic process with unique kinetic triplets. The experimental and model plots were compared to determine the reaction mechanisms. Regions I and II of the first step were found to be 3-D diffusion of spherical symmetry (\(D_{3}\)) and cylindrical symmetry (\(D_{4}\)) processes, respectively, while the final step was found to be an assumed random nucleation (\(A_{2}\)) process. Pre-exponential factors were calculated from \(E_{\upalpha}\) and reaction mechanism. The related thermodynamic functions of the transition state complexes were evaluated and found to agree well with the experimental data.
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Acknowledgements
The authors would like to thank the Materials Chemistry Research Center, Center of Excellence for Innovation in Chemistry (PERCH-CIC), Department of Chemistry, Faculty of Science, Khon Kaen University. The support from National Research University Project through Advanced Functional Material Research Cluster, Khon Kaen University, Office of the Higher Education, is also highly acknowledged.
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Sronsri, C., Noisong, P. & Danvirutai, C. Thermal decomposition kinetics of Mn0.9Co0.1HPO4·3H2O using experimental-model comparative and thermodynamic studies. J Therm Anal Calorim 127, 1983–1994 (2017). https://doi.org/10.1007/s10973-016-5720-3
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DOI: https://doi.org/10.1007/s10973-016-5720-3