Thermodynamic assessment of the Ce-O system in solid state from 60 to 67 mol.% O

A thermodynamic dataset was developed for the central part of the Ce-O system covering the range between Ce2O3 and CeO2 up to about 2000 K. All literature data for the thermodynamic functions, the phase diagram and crystallography were critically assessed. The modeling of the phases takes into account their crystal chemistry including order-disorder behavior. From the dataset, diagrams were calculated for the (1) heat capacities of CeO2 and Ce2O3, (2) enthalpy increment of CeO2, (3) chemical potentials of oxygen in CeO2-x, (4) partial enthalpies of oxygen in CEO2-x, (5) the partial phase diagram of Ce-O and (6) chemical potentials of oxygen in the two-phase areas. These diagrams reproduce fairly well the experimental data from literature. (orig.)