Thermodynamic stability of Sr2CeO4

Thermochemistry of the reaction between SrCO3 and SrCeO3, represented as SrCO3(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 as In p(CO2) (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)). (C) 2006 Published by Elsevier B.V.