The sodium pyrovanadate (Na₄V₂O₇) powder was synthesized by solid-state reaction using sodium carbonate (Na₂CO₃) and vanadium pentoxide (V₂O₅) as raw materials. X-ray powder diffraction (XRD), scanning electron microscope (SEM), and differential scanning calorimeter (DSC) were used to accurately characterize the synthesized sample. The solid-state phase transformation from α-Na₄V₂O₇ to β-Na₄V₂O₇ occurs at the temperature 696 K and the enthalpy is equals to 1.03 ± 0.01 kJ/mol, the endothermic effect at 931 K and the enthalpy is equals to 31.35 ± 0.31 kJ/mol, which is related to the melting of Na₄V₂O₇. The high-temperature heat capacity of Na₄V₂O₇ was measured using a Multi-high temperature calorimeter 96 line and DSC. The obtained high-temperature heat capacity of Na₄V₂O₇, as a function of temperature, was modeled as: Cp=314.62+0.05T-5494390T^-2 J·mol^-1·K^-1 (298.15-873 K). The temperature dependence on heat capacity was then used for computing changes in the enthalpy, entropy, and Gibbs free energy at the specific temperature internal.

以碳酸钠（Na ₂ CO ₃）和五氧化二钒（V ₂ O ₅）为原料，通过固相反应合成了丙酮酸钠（Na ₄ V ₂ O ₇）粉末。X射线粉末衍射（XRD），扫描电子显微镜（SEM）和差示扫描量热仪（DSC）用于精确表征合成样品。从所述固态相变α-的Na ₄ V ₂ ö ₇ β-的Na ₄ V ₂ ö ₇发生在696 K的温度下且焓等于1.03±0.01 kJ / mol，在931 K时的吸热效应且焓等于31.35±0.31 kJ / mol，这与Na ₄ V ₂ O的熔化有关₇。Na ₄ V ₂ O ₇的高温热容量使用多高温量热计96线和DSC测量。所获得的Na ₄ V ₂ O ₇的高温热容随温度的变化模型为：Cp = 314.62 + 0.05T- 5494390T ^-2  J·mol ^-1 ·K ^-1（298.15-873 K）。然后将温度对热容量的依赖性用于计算特定内部温度下的焓，熵和吉布斯自由能的变化。