中文摘要：

为了提高Ce0.8Sm0.2O1.9（CSO）基氧离子导电材料的离子导电性,用2步化学共沉淀法制备Ce0.8Sm0.2O1.9-La9.33Si6O26（CSO-LSO）氧离子导电复合材料。通过X射线衍射分析材料的物相组成,利用扫描电子显微镜观察材料的微观形貌,利用交流阻抗分析测试材料的离子导电特性。结果表明,经300℃煅烧可得到纯相的CSO粉体,平均晶粒尺寸为9.8 nm。在整个测试温度范围内,CSO-LSO复合材料的氧离子电导率比单相CSO提高了10倍以上;700℃时,CSO-LSO复合材料电导率为0.12 S.cm-1,比CSO的总电导率（0.008 6 S.cm-1）提高约14倍。通过分析得出界面效应是提高复合材料电导率的主要因素。

英文摘要：

In order to improve the ionic conductivity of the Ce0.8Sm0.2O1.9（CSO）based oxygen-ionic conductor,Ce0.8Sm0.2O1.9-La9.33Si6O26（CSO-LSO）composite materials were prepared by a two-step coprecipitation process.Phases of the samples were analyzed by using X-ray diffraction,and the microstructures were investigated by using a scanning electron microscope.An electrochemical complex impedance measurement was performed to measure the sample conductivities.The results show that the powders with pure fluorite structure can be obtained after the CSO precursor was calcined at 300℃,and the average grain size of the powders is 9.8 nm.The conductivities of the CSO-LSO composites are 10 times in magnitude higher than those of the CSO ceramic at all measurement temperatures.The conductivity of the composite is 0.12 S·cm-1,which is about 14 times of that of the CSO ceramic（0.008 6 S·cm-1）at 700℃.The phase interfacial effect is proposed to play a key role on the conductivity improvement.