Thermodynamic stability of SrCeO3

Thermochemistry of the reaction between SrCO3 and CeO2 aswas studied over the temperature range 1113–1184 K. The equilibrium pressure of CO2(g) over the ternary phase mixture of SrCO3(s), CeO2(s) and SrCeO3(s) was measured at various temperatures using a tensimetric apparatus. The temperature dependence of the measured CO2(g) pressure could be represented asTensimetric measurements were also carried out for the decomposition of SrCO3(s). The equilibrium vapor pressures of CO2(g) over the biphasic mixture of SrCO3(s) and SrO(s) could be represented asThe observed CO2 pressures were compared with those obtained for reaction (1). Simultaneous thermogravimetric/differential thermal analysis experiments were carried out for reaction (1) and for the decomposition of SrCO3 in CO2 atmospheres. All these results were used to derive the thermodynamic properties of SrCO3(s) and SrCeO3(s).