Defect Chemistry and Thermomechanical Properties of Ce0.8Pr x Tb0.2 − x O2 − δ

摘要: The oxygen nonstoichiometry (δ) of Ce 0.8 Pr x Tb 0.2-x O 2-δ (x = 0, 0.05, 0.10, 0.15, 0.20) was measured as a function P o2 at temperatures between 600 and 900°C by coulometric titration thermogravimetry. A nonideal solution model, allowing for linear δ dependence the partial molar enthalpy reduction in dopants, could successfully reproduce experimentally determined nonstoichiometry. X-ray absorption near-edge spectroscopy measurements were performed Ce/Pr/Tb L3 L2 edges. valence state each dopant affected presence co-dopant. redox properties strongly depended on lattice strain energy mean metal-oxygen bond strength. thermal chemical expansion coefficients dilatometry. nonlinear behavior coefficient originated from due to increasing with temperature.