Thermodynamic modelling and applications of Ce–La–O phase diagram

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.