Abstract
Mg3(VO4)2 powder was synthesized via a simple solid-state reaction under air atmosphere, and X-ray diffraction was employed to investigate the cell parameters of the as-prepared powder. The cell parameters indicated that the sample was crystallized in the form of Cmca orthorhombic system with lattice parameters, a = 6.053 Å, b = 11.442 Å, and c = 8.330 Å. The high-temperature enthalpy changes in Mg3(VO4)2 were measured in the range of 573–1473 K by drop calorimetry for the first time. Furthermore, the temperature dependence of the heat capacity of Mg3(VO4)2 was calculated by considering the enthalpy changes results. Thermodynamic properties (changes in enthalpy, entropy, and Gibbs free energy) were also calculated in the range of 298.15–1473 K.
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