Subsolidus phase equilibria in the NiO–CeO2 and La2O3–CeO2–Fe2O3 systems

Subsolidus equilibria in air in the NiO–CeO2 and La2O3–CeO2–Fe2O3 systems were studied. In the NiO–CeO2 and Fe2O3–CeO2 systems, no binary compound and no solid solubility were detected. La2O3 was soluble in CeO2, forming a cubic fluorite solid solution up to La0.5Ce0.5O1.75, whereas no solid solubility of CeO2 in La2O3 was detected. In the La2O3–CeO2–Fe2O3 system, no ternary compound was found. The tie line is between LaFeO3 and CeO2.