Thermodynamic stability of Sr2CeO4

Thermochemistry of the reaction between SrCO3 and SrCeO3, represented asSrCO3(s) + SrCeO3(s) = Sr2CeO4(s) + CO2(g),was studied over the temperature range 1035–1135 K. The equilibrium pressure of CO2(g) over the ternary phase mixture of SrCO3(s), SrCeO3(s) and Sr2CeO4(s) was measured at various temperatures by a tensimetric apparatus. The temperature dependence of the measured equilibrium CO2(g) pressure could be represented asln pCO2(Pa)(±0.04)=−24742(±550)T+28.43(±0.55) (1035≤T(K)≤1115)Simultaneous thermogravimetric (TG)/differential thermal analysis (DTA) experiments were carried out for reaction between SrCO3(s) and CeO2(s) in CO2 atmosphere. The results were used to derive the thermodynamic properties of Sr2CeO4(s).