Heat capacity measurement of BaUO3

The heat capacity of the perovskite BaUO3 has been measured by using a diff erential scanning calorimeter (DSC) in the temperature range of 373-873 K. The results were consistent with the values calculated by Neumann-Kopp's la w. By comparison with the C-p values estimated from the Debye temperature, it appears that the Schottky term contributes to the heat capacity of BaUO3 . Enthalpy increment, entropy, free energy function and other thermodynamic functions of BaUO3 as a function of temperature have been calculated from the measured heat capacity and the published data. From the derived molar G ibbs energy, the equilibrium oxygen pressure has also been calculated for t he reaction BaUO3/BaUO4. (C) 2001 Elsevier Science B.V. All rights reserved .