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In this study, ultrafine Ce0.8La0.2–x Y x O1.9(for x=0, 0.05, 0.10, 0.15, 0.20) powders were successfully prepared by the sol-gel method.The samples were characterized by fourier transform infrared(FTIR), thermogravimetric and differential scanning calorimetry(TG-DSC), X-ray diffraction(XRD), scanning electron microscopy(SEM), AC impedance and thermal expansion measurements.Experimental results indicated that highly phase-pure cubic fluorite electrolyte Ce0.8La0.2–x Y x O1.9 powders were obtained after calcining at 600 °C.The as-synthesized powders exhibited high sintering activity, the Ce0.8La0.2–x Y x O1.9 series electrolytes which have higher relative densities over 96% could be obtained after sintered at 1400 °C for 4 h.Ce0.8La0.15Y0.05O1.9 electrolyte sintered at 1400 °C for 4 h exhibited higher oxide ionic conductivity(σ800 oC=0.057 S/cm), lower electrical activation energy(E a=0.87 e V) and moderate thermal expansion coefficient(TEC=15.5×10-6 K-1, temperature range 25–800 °C).
In this study, ultrafine Ce0.8La0.2-x Y x O1.9 (for x = 0, 0.05, 0.10, 0.15, 0.20) powders were successfully prepared by the sol- gel method.The samples were characterized by fourier transform infrared (FTIR), thermogravimetric and differential scanning calorimetry (TG-DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM), AC impedance and thermal expansion measurements. Experimental results indicated that highly phase-pure cubic fluorite electrolyte Ce0. 8La0.2-x Y x O1.9 powders were obtained after calcining at 600 ° C. The as-synthesized powders exhibited high sintering activity, the Ce0.8La0.2-x Y x O1.9 series electrolytes which have higher relative densities over 96% could be obtained after sintering at 1400 ° C for 4 h. Ce0.8La0.15Y0.05O1.9 electrolyte sintered at 1400 ° C for 4 h showing higher oxide ionic conductivity (σ800 oC = 0.057 S / cm), lower electrical activation energy (E a = 0.87 e V) and moderate thermal expansion coefficient (TEC = 15.5 × 10 -6 K-1, temperature range 25 -800 ° C).