Thermodynamic functions of alkaline earth monouranates from calorimetric measurements

Abstract

High temperature differential calorimetry was used to determine the enthalpy increments of BaUO₄, α-SrUO₄ and CaUO₄ relative to room temperature. The measurements covered the temperature range 1000-1735 K. From these enthalpy values other thermodynamic functions, such as C^XXX_pT, S^XXX_T and -(G^XXXT - H^XXX₂₉₈)/T, were deduced using C^XXX_p298 and S^XXX₂₉₈ from the literature. The high temperature C^XXX_pT values for the monouranates obtained in this study are discussed in relation to the low temperature data available in the literature.