La_(9.33)Si_6O_(26)基氧离子导电复合材料的制备与导电性  

Fabrication and Conductivity of La_(9.33)Si_6O_(26)-based Composite Oxygen-ionic Conductor

作　　者：刘超峰[1,2] 张鸿[1,2] 夏俊霄[1,2] 李根[1,2] 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]中南大学有色金属材料科学与工程教育部重点实验室,长沙410083

出　　处：《无机材料学报》2011年第10期1043-1048,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金(50872155)~~

摘　　要：采用改性共沉淀法合成了La9.33Si6O26-10wt%Zr0.86Y0.14O1.92两相共存的氧离子导电复合材料,利用X射线衍射、扫描电子显微镜、交流阻抗技术分别表征了材料的相组成、微观组织和离子导电性.结果表明,复合材料粉体平均晶粒尺寸为35 nm,烧结块体的平均颗粒尺寸为500 nm;在300～700℃温度范围内,复合材料的导电率均高于La9.33Si6O26或Zr0.86Y0.14O1.92单相材料,且700℃时比La9.33Si6O26高出1个数量级.结合交流阻抗谱及电模量谱对复合材料的导电机理进行了分析讨论.The oxygen-ionic conductor of La9.33Si6O26-10wt% Zr0.86Y0.14O1.92 composite material was prepared by using a modified co-precipitation method.X-ray diffraction,scanning electron microscope and complex impedance were adopted to investigate the phase component,microstructures and conductivities of the composite material,re-spectively.The results show that the average grain size of the as-calcined powder is 35 nm and the average particle size of the as-sintered composite ceramic is about 500 nm.The conductivities of the composite ceramic are higher than those of the single phase La9.33Si6O26 and Zr0.86Y0.14O1.92 ceramic at the temperatures from 300℃ to 700℃.The conductivity of the composite ceramic is one order in magnitude higher than that of polycrystalline La9.33Si6O26 at 700℃.The conduction mechanism of the composite material is discussed by the analysis of impedance spectra and electric modulus spectra.

关 键 词：La9.33Si6O26 Zr0.86Y0.14O1.92 复合材料 共沉淀法 离子导电性 

分 类 号：TB332[一般工业技术—材料科学与工程]