Ce_(0.8)Sm_(0.2)O_(1.9)基纳米复合材料的共沉淀合成与氧离子导电性  

Coprecipitation Synthesis and Oxide Ionic Conductivities of Ce_(0.8)Sm_(0.2)O_(1.9)-based Nanocomposite Materials

作　　者：张鸿[1] 张哲[1] 马国强[1] 张宇星[1] 李志成[1] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083

出　　处：《无机材料学报》2009年第2期353-356,共4页Journal of Inorganic Materials

基　　金：教育部留学回国人员科研启动基金(2006331;20071108);高等学校博士点专项科研基金(20070533119)

摘　　要：用化学共沉淀法制备了Ce0.8Sm0.2O1.9-La9.33Si6O26纳米复合氧离子导电材料,通过X射线衍射和透射电子显微镜对合成材料的相结构进行了分析,利用交流阻抗分析测试研究了材料的离子导电性.结果表明,纳米复合材料的煅烧粉末的平均晶粒尺寸为20nm、烧结陶瓷体的平均晶粒尺寸为44nm;700℃时,纳米复合导电体的离子导电率为0.25Ω/cm;在整个测试温度范围内,纳米复合导电体比纯La9.33Si6O26提高了3个以上数量级,并高于纯相Ce0.8Sm0.2O1.9的导电性.Ce0.8 Sm0.2 O1.9-La9.33 Si6 026 nanocomposite materials were prepared by a two-step eoprecipitation synthesis process. Phases and microstructure were investigated by X-ray diffraction and transmission electron microscope. Conductivities were measured by an A. C. impedance measurement system. The results show that the calcined nanocomposites have average grain size of 20nm and the sintered bulks have average grain size of 44nm. The oxide-ion conductivity of the nanocomposite material is 0. 25Ωcm at 700℃. The eonductivities of the nanocomposites are 3 orders higher than that of pure La9.33Si6O26 ceramics, which are also higher than that of Ce0.8Sm0.2O1.9 conductor in the test temperatures range. The conducting mechanisms for the nanocomposite ionic conductors are discussed.

关 键 词：纳米复合材料 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]