ИСТИНА

The appearance of the new experimental and theoretical studies of uranium dioxide requires re-counting thermodynamic functions of UO2 that were published in reference book [1]. Refined thermodynamic functions of uranium dioxide in the crystalline and liquid states are presented in the temperature range 100 – 8000 K. The equations approximating the temperature dependence of heat capacity of the solid and liquid phases UO2 are derived on the base of the experimental data (calorimetric measurements) available in literature in the temperature ranges 298.15 – 3130 K and 3130 – 8000 K, accordingly. The resulting equations are used to calculate the thermodynamic functions: the heat capacity, the absolute entropy, the enthalpy increments and the reduced Gibbs free energies. The resulting data is added to the database of the IVTANTHERMO software package.