Abstract
The chemical stability of perovskites LaBO3 where B = V, Cr, Mn, Fe, Co, Ni was studied by thermogravimetry at 1000°C in gas mixtures of CO2H2, O2CO2 and O2Ar at 1 bar.The stability limits of the perovskite phases expressed in terms of -log Po2★ (Po2★ = critical oxygen partial pressure in bar) were for LaCrO3 and LaVO3 (greater than 21.1), LaFeO3 (16.95), LaMnO3 (15.05), LaCoO3 (7.0) and for LaNiO3 (∼0.6). The changes in standard enthalpy ΔH° and entropy ΔS° of the following reactions were obtained.LaVO4=LaVO3+1202δ=328kJmol°=135Jmol·deg.,LaMnO3=12La2O3+MnO
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