TiO2掺杂Ce0.8Sm0.2O1.9材料的制备与表征  

Preparation and characterization of titania doped Ce0.8Sm0.2O1.9 materials

作　　者：程继贵[1] 李洁[1] 刘岸平[1] 夏永红[1] 董洁[1] 蔡艳波[1] 

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009

出　　处：《功能材料》2007年第A04期1296-1299,共4页Journal of Functional Materials

基　　金：基金项目：安徽省自然科学基金资助项目（070414186）

摘　　要：通过凝胶浇注法制备了TiO2掺杂量为0-15％（摩尔分数）的T1O2-Ce0.8Sm0.2O1.9（TixCe0.8xSm0.2O2-y，TSDC）粉体。采用X射线衍射、透射电镜对所得粉体的相组成和颗粒形貌进行了测试分析，考察了粉体的烧结性能。此外，还测定了不同组成TSDC烧结体在空气和氢气气氛中的电导率。研究结果表明：凝胶浇注所得干凝胶在较低温度（500℃）下煅烧后，TiO2和Sm2O3即能完全固溶进CeO2晶格中，形成具有单一立方相结构和纳米粒度的TSDC粉体，且粉体粒径随TiO2掺杂量的增加而增大。上述粉体具有较高的烧结活性，其成形压坯在1400℃烧结后，相对密度可达95％以上。此外，测试气氛对TSDC材料的电导率有明显的影响，在空气中，随着TiO2掺入量的增大，TSDC材料的电导率减小，而在H2气氛中，电导率则明显增大，TiO2的掺入，降低了电导活化能。TiO2-Ce0.8Sm0.2O1.9 （TixCe0.8-xSm0.2O2-y, TSDC ）powders doped with 0-15% tool percents of TiO2 were prepared by the gelcasting process. Phase constitution of the powders was characterized by X-ray diffraction （XRD）. Particle size and shape of the powders were observed by transmission electrinic microscope （TEM）. Density, electrical conductivity of the sintered TixCe0.8-xSm0.2O2-y （TSDC） materials with different TiO2 dopants were tested. The results showed that nanosized TixCe0.8-xSm0.2O2-y powders with single cubic fluorite phase can be obtained at a relatively low calcinations temperature. The doping of TiO2 can enhance the sintering of the Ce0.8Sm0.2O1.9 powders. TiOE-Ce0.8Sm0.2O1.9 compacts prepared in this work can be sintered to a high density at relatively low sintering temperature with appropriate TiO2 addition. Furthermore, the TixCe0.8-xSm0.2O2-y materials show low conductive activation energy and high electrical conductivity in H2.

关 键 词：Ti02掺杂Ce0.8Sm0.2O1.9(TSDC) 凝胶浇注 烧结行为 电导率 

分 类 号：TB32[一般工业技术—材料科学与工程] TB34