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Ternary oxide GdBiGeO was synthesized by a ceramic method. The heat capacity of crystalline gadolinium bismuth germanate as a function of temperature in the range 373-1000 K has been studied by differential scanning calorimetry. It has been demonstrated that the temperature dependence of the heat capacity can be described by the classical Maier-Kelley equation. From the experimental C = f( T) data, the thermodynamic functions (the change in enthalpy and entropy) of ternary oxide GdBiGeO have been calculated. [ABSTRACT FROM AUTHOR]

The molar heat capacity of BiVO has been measured in the range 356-980 K by the differential scanning calorimetry method. There is an extreme point in the C = f( T) curve at about T = 532 K, which is caused by the existence of a phase transition. The thermodynamic properties of bismuth orthovanadate have been determined from the experimental data. [ABSTRACT FROM AUTHOR]