Ce_(0.8)Sm_(0.2)O_(1.9)-La_(9.33)Si_6O_(26)复合材料的制备与氧离子导电性  

Fabrication and oxygen-ionic conductivities of Ce_(0.8)Sm_(0.2)O_(1.9)-La_(9.33)Si_6O_(26) composite materials

作　　者：张哲[1] 张鸿[1] 刘超峰[1] 刘玉龙[1] 李志成[1,2] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金材料科学与工程》2011年第5期682-688,共7页Materials Science and Engineering of Powder Metallurgy

基　　金：国家自然科学基金资助项目(50872155);粉末冶金国家重点实验室开放课题

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。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.

关 键 词：Ce0.8Sm0.2O1.9 La9.33Si6O26 复合材料 共沉淀合成 氧离子导电性 

分 类 号：TQ150.1[化学工程—电化学工业]