Thermodynamic modelling and applications of Ce−La−O phase diagram
(1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
2. Department of Electronics, Institute of Huizhou, Huizhou 516001, China)
2. Department of Electronics, Institute of Huizhou, Huizhou 516001, China)
Abstract: The Ce−La−O system was investigated via experiments and thermodynamic modeling. A series of CeO2−LaO1.5 mixtures were prepared by co-precipitation technique and examined by X-ray diffraction. Mutual solubilities between LaO1.5 and CeO2 at 1273 K were determined. Using the new experimental data together with literature information, a set of self-consistent thermodynamic parameters for the CeO2−LaO1.5 system were optimized. Combined with thermodynamic descriptions of Ce−O and La−O systems from literature, several property diagrams of Ce−La−O system were calculated and used to explain oxidation process of the Ce−La alloys. The fluorite phase is the unique oxidation products for most of the Ce−La alloys.
Key words: Ce−La alloy; phase diagram; thermodynamics; oxidation