Synthesis and High-Temperature Heat Capacity of Y2Ge2O7

Аннотация

Yttrium germanate Y₂Ge₂O₇ was prepared by solid-phase synthesis from a stoichiometric Y₂O₃–GeO₂ mixture under multistage calcination in air within a temperature range of 1273–1473 K. The molar heat capacity of polycrystalline samples was measured by differential scanning calorimetry (DSC), and the C_P = f(T) dependence was used to calculate the thermodynamic properties of yttrium digermanates, such as the enthalpy and entropy changes and the reduced Gibbs energy.