Abstract
Kinetic triplet of the complex decomposition processes of Co3Ni3(PO4)2·8H2O was evaluated for the first time by using the deconvolution method to separate the overlapping DTG curves. After the completion of the deconvolution, five steps of the decomposition were obtained. The activation energy E and the pre-exponential factor A of each step were determined by KAS method. The kinetic compensation effect (KCE) method was applied to identify the individual step of the decomposition. Each master plot was simplified by generating the general equations and combined with the nonlinear regression curve fitting. According to kinetic analysis results obtained from this modified method, it was found that the early four steps of dehydration follow the mechanisms of nucleation and subsequent growth with different n-orders, while the last step occurs in the same mechanism but accompanied by the phase transition (lattice reorientation).
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Acknowledgements
We thank the Department of Chemistry and the Department of Physics (for XRD), Faculty of Science, Khon Kaen University, for providing research facilities. The financial support from the Center for Innovation in Chemistry (PERCH-CIC), Ministry of Education as well as from the Higher Education Research Promotion and National Research University Project of Thailand, Office of Higher Education Commission, through the Advanced Functional Materials Cluster of Khon Kaen University (contract number NRU544018), is gratefully acknowledged.
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Kullyakool, S., Siriwong, K., Noisong, P. et al. Kinetic triplet evaluation of a complicated dehydration of Co3(PO4)2·8H2O using the deconvolution and the simplified master plots combined with nonlinear regression. J Therm Anal Calorim 127, 1963–1974 (2017). https://doi.org/10.1007/s10973-016-5837-4
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DOI: https://doi.org/10.1007/s10973-016-5837-4