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Selective self-assembly synthesis of MnV2O6·4H2O with controlled morphologies and study on its thermal decomposition

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Abstract

The MnV2O6·4H2O with rod-like morphologies was synthesized by solid-state reaction at low heat using MnSO4·H2O and NH4VO3 as raw materials. XRD analysis showed that MnV2O6·4H2O was a compound with monoclinic structure. Magnetic characterization indicated that MnV2O6·4H2O and its calcined products behaved weak magnetic properties. The thermal process of MnV2O6·4H2O experienced three steps, which involves the dehydration of the two waters of crystallization at first, and then dehydration of other two waters of crystallization, and at last melting of MnV2O6. In the DSC curve, the three endothermic peaks were corresponding to the two steps thermal decomposition of MnV2O6·4H2O and melting of MnV2O6, respectively. Based on the Kissinger equation, the average values of the activation energies associated with the thermal decomposition of MnV2O6·4H2O were determined to be 55.27 and 98.30 kJ mol−1 for the first and second dehydration steps, respectively. Besides, the thermodynamic function of transition state complexes (ΔH ≠, ΔG ≠, and ΔS ≠) of the decomposition reaction of MnV2O6·4H2O were determined.

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Acknowledgements

This study was financially supported by the Guangxi Natural Scientific Foundation of China (Grant No. 2011GXNSFA018036), and the Guangxi Science and Technology Agency Research Item of China (Grant No. 0992001-5).

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, China

    Xuehang Wu, Wenwei Wu, Xuemin Cui & Sen Liao

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  1. Xuehang Wu
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  2. Wenwei Wu
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  3. Xuemin Cui
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  4. Sen Liao
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Correspondence to Wenwei Wu.

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Wu, X., Wu, W., Cui, X. et al. Selective self-assembly synthesis of MnV2O6·4H2O with controlled morphologies and study on its thermal decomposition. J Therm Anal Calorim 109, 163–169 (2012). https://doi.org/10.1007/s10973-011-1577-7

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  • DOI: https://doi.org/10.1007/s10973-011-1577-7

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