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), thermog...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).展开更多
基金Project supported by National Natural Science Foundation of China(51102073)the research fund of Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province(AE201361)+1 种基金Natural Science Foundation of Anhui Province of China(10040606Q53,1308085QB35)the Outstanding Young Talent Project in Colleges and Universities of Anhui Province
文摘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).