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Rapid synthesis, kinetics and thermodynamics of binary Mn0.5Ca0.5(H2PO4)2 · H2O

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Abstract

The binary manganese and calcium dihydrogen phosphate monohydrate Mn0.5Ca0.5(H2PO4)2 · H2O was synthesized by a rapid and simple co-precipitation method using phosphoric acid, manganese metal, and calcium carbonate at ambient temperature. Thermal transformation shows complex processes and the final decomposed product was the binary manganese calcium cyclotetraphosphate MnCaP4O12. The activation energies of some decomposed steps were calculated by Kissinger method. Activated complex theory has been applied to each step of the reactions and the thermodynamic functions are calculated. These values for transformation stages showed that they are non-spontaneous processes without the introduction of heat. The differences of physical and chemical properties of the synthesized compound and its decomposed product are compared with M(H2PO4)2 · H2O and M2P4O12 (M = Mn and Ca), which indicate the effects of the presence of Ca ions in substitution of Mn ions and confirm the formation of solid solution.

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Acknowledgements

The authors would like to thank the Chemistry Department, Khon Kaen University for facilities. This work is financially supported by the Thailand Research Fund (TRF) and the Commission on Higher Education (CHE): Research Grant for New Scholar (MRG52_Banjong Boonchom) and King Mongkut’s Institute of Technology Ladkrabang Research (KMITL Research), Ministry of Science and Technology, Thailand.

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Authors and Affiliations

  1. King Mongkut’s Institute of Technology Ladkrabang, Chumphon Campus, 17/1 M.6 Pha Thiew District, Chumphon, 86160, Thailand

    Banjong Boonchom

  2. Department of Chemistry, Faculty of Science, King Mongkut’s Institute of Technology Ladkrabang, Ladkrabang, Bangkok, 10520, Thailand

    Banjong Boonchom

  3. Department of Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand

    Chanaiporn Danvirutai

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  1. Banjong Boonchom
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  2. Chanaiporn Danvirutai
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Correspondence to Banjong Boonchom.

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Boonchom, B., Danvirutai, C. Rapid synthesis, kinetics and thermodynamics of binary Mn0.5Ca0.5(H2PO4)2 · H2O. J Therm Anal Calorim 98, 717–723 (2009). https://doi.org/10.1007/s10973-009-0109-1

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  • DOI: https://doi.org/10.1007/s10973-009-0109-1

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