As a promising anode material for magnesium ion rechargeable batteries, magnesium metavanadate (MgV₂O₆) has attracted considerable research interest in recent years. A MgV₂O₆ sample was synthesized via a facile solid-state reaction by multistep-firing stoichiometric mixtures of MgO and V₂O₅ powder under an air atmosphere. The solid-state phase transition from α-MgV₂O₆ to β-MgV₂O₆ occurred at 841 K and the enthalpy change was 4.37 ± 0.04 kJ/mol. The endothermic effect at 1014 K and the enthalpy change was 26.54 ± 0.26 kJ/mol, which is related to the incongruent melting of β-MgV₂O₆. In situ XRD was performed to investigate phase transition of the as-prepared MgV₂O₆ at high temperatures. The cell parameters obtained by Rietveld refinement indicated that it crystallizes in a monoclinic system with the C2/m space group, and the lattice parameters of a = 9.280 Å, b = 3.501 Å, c = 6.731 Å, β = 111.76 °. The solid-state phase transition from α-MgV₂O₆ to β-MgV₂O₆ was further studied by thermal kinetics, indicating that this process is controlled first by a fibril-like mechanism and then by a spherulitic-type mechanism with an increasing heating rate. Additionally, the enthalpy change of MgV₂O₆ at high temperatures was measured utilizing the drop calorimetry, heat capacity was calculated and given as: Cp = 208.3 + 0.03583T-4809000T⁻² (298 – 923 K) (J mol⁻¹ K⁻¹), the high-temperature heat capacity can be used to calculate Gibbs free energy of MgV₂O₆ at high temperatures.

偏钒酸镁（MgV ₂ O ₆）作为一种很有前途的镁离子二次电池负极材料，近年来引起了人们的广泛研究兴趣。MgV ₂ O ₆样品是通过在空气气氛下多步烧制 MgO 和 V ₂ O ₅粉末的化学计量混合物，通过简单的固态反应合成的。_{从α-MgV 2} O ₆到β-MgV ₂ O ₆的固态相变发生在841 K，焓变为4.37 ± 0.04 kJ/mol。在 1014 K 的吸热效应和焓变为 26.54 ± 0.26 kJ/mol，这与 β-MgV 熔化不一致有关₂ O ₆。进行原位XRD以研究所制备的MgV ₂ O ₆在高温下的相变。Rietveld细化得到的晶胞参数表明，它在C2/m空间群的单斜晶系中结晶，晶格参数a  = 9.280 Å，b  = 3.501 Å，c  = 6.731 Å，β  = 111.76°。_{从α-MgV 2} O ₆到β-MgV ₂ O ₆的固态相变通过热动力学进一步研究，表明该过程首先受原纤状机制控制，然后由球晶型机制控制，加热速率增加。此外，使用滴量热法测量 MgV ₂ O ₆在高温下的焓变，计算热容量并给出：Cp = 208.3 + 0.03583T-4809000T ^-2 (298 – 923 K) (J mol ^-1  K ^-1 )，高温热容可用于计算MgV ₂ O ₆在高温下的吉布斯自由能。