Ce_(0.8)Sm_(0.2)O_(1.9)-La_(0.9)Sr_(0.1)Ga_(0.8)Mg_(0.2)O_(2.85)复合材料的制备与导电性  

Preparation and conductivities of Ce_(0.8)Sm_(0.2)O_(1.9)-La_(0.9)Sr_(0.1)Ga_(0.8)Mg_(0.2)O_(2.85) composite materials

作　　者：夏俊霄[1] 张鸿[1] 李亚玲[1] 刘超峰[1] 李志成[1,2] 

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

出　　处：《中南大学学报（自然科学版）》2011年第11期3309-3314,共6页Journal of Central South University:Science and Technology

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

摘　　要：为研究复合材料氧离子导电体的导电特性,采用化学共沉淀法制备Ce0.8Sm0.2O1.9-La0.9Sr0.1Ga0.8Mg0.2O2.85纳米复合粉体,并获得复合陶瓷材料。通过X线衍射仪和扫描电子显微镜对复合材料的物相组成与微观结构进行分析,利用交流阻抗测试研究材料的离子导电性。研究结果表明:煅烧复合粉体的平均晶粒尺寸为15 nm;复合材料的导电性均明显高于复合组元的单相材料的导电性;La0.9Sr0.1Ga0.8Mg0.2O2.85中La2O3过量3%(质量分数)的复合材料体现最好的导电性,在700℃时的导电率为0.106 S/cm。通过交流阻抗谱分析晶粒、晶界特性,探讨复合电解质材料的导电机理。In order to study the conduction characteristic of composite oxide-ionic conductors,Ce0.8Sm0.2O1.9-La0.9Sr0.1Ga0.8Mg0.2O2.85 nano-composite powders were prepared by a co-precipitation method and the related composite ceramics were obtained.The phase component and microstructures of the composite materials were investigated by using X-ray diffraction and scanning electron microscopy,respectively.AC impedance test was employed to analyze the conductivities of the composites.The results show that nano-composite powders with the average grain size of 15 nm were obtained,and the conductivities of composite materials are much higher than those of the pure phase of composite component.The oxide-ionic conductivities of the composite material with 3% excess of La2O3 in La0.9Sr0.1Ga0.8Mg0.2O2.85 show the highest ones,and the conductivity is 0.106 S/cm at 700 ℃.By analyzing grain and grain-boundary effects from the AC impedance spectroscopes,the conduction mechanism of the composite materials was discussed.

关 键 词：Ce0.8Sm0.2O1.9 La0.9Sr0.1Ga0.8Mg0.2O2.85 复合材料 共沉淀合成 氧离子导电性 

分 类 号：TB33[一般工业技术—材料科学与工程]