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The molar heat capacity of PbVO and PbVO in the temperature range 350-1000 K was measured by differential scanning calorimetry. It was determined that the plot C = f( T) for PbVO has an extremum within the range 416-516 K, which is due to a phase transition. A correlation was found between the heat capacity and composition of oxides in the PbO-VO system. The data obtained allowed one to predict the specific heat capacity value for Pb(VO). [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]