高等学校化学学报 ›› 2001, Vol. 22 ›› Issue (8): 1279.

• 研究论文 • 上一篇    下一篇

Ce1-xGdxO2-x/2的溶胶-凝胶法合成及其性质

蒋凯1, 彭程1, 李五聚1, 王琳2, 王鸿燕2, 梁宏伟2, 孟健2   

  1. 1. 河南师范大学化学与环境科学学院, 河南省高等学校环境科学与工程重点实验室, 新乡 453002;
    2. 中国科学院长春应用化学研究所稀土化学与物理开放实验室, 长春 130022
  • 收稿日期:2000-08-23 出版日期:2001-08-24 发布日期:2001-08-24
  • 通讯作者: 孟健(1956年出生),男,研究员,博士生导师,从事无机材料化学研究.E-mail:jmeng@ns.ciac.jl.cn E-mail:jmeng@ns.ciac.jl.cn
  • 基金资助:

    国家重点基础研究发展规划项目(批准号:GB1998061316);国家自然科学基金(批准号:29831010;59802011);河南省杰出青年基金;河南省自然科学基金(批准号:004030300

Sol-gel Synthesis and Properties of Ce1-xGdxO2-x/2 Solid Solutions

JIANG Kai1, PENG Cheng1, LI Wu-Ju1, WANG Lin-WANG Hong-Yan2, LIANG Hong-Wei2, MENG Jian2   

  1. 1. College of Chemistryand Environmental Science, Henan Normal University, The Key Laboratoryof Environmental Scienceand Technology of High Education of Henan Province, Xingxiang 453002, China;
    2. Key Laboratory of Rare Earth Chemistryand Physics, Changchun Instituteof Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
  • Received:2000-08-23 Online:2001-08-24 Published:2001-08-24

摘要: 利用溶胶-凝胶法合成了Ce1-xGdxO2-x/2(x=0.1~0.6)系列固体电解质,系统地研究了其结构、热膨胀系数和导电性.XRD结果表明,160℃即完全形成立方萤石结构.由于溶胶-凝胶法合成的物质粒度均匀,颗粒小,故在较低温度(1300℃)时即可形成高致密样品,此温度明显低于传统的高温固相法烧结温度(1600~1650℃).高温X射线衍射测得Ce0.8Gd0.2O1.9的热膨胀系数为8.125×10-6K1.阻抗谱表明,溶胶-凝胶法合成可减少或消除固体电解质的晶界电阻,600℃时Ce0.8Gd0.2O1.9的电导率为5.26×10-3S/cm,活化能Ea=0.82eV.

关键词: 固体电解质, 溶胶-凝胶法, 氧离子导体, CeO2

Abstract: Aseries of solid electrolytes Ce1-x Gdx O2-x/2 ( x=0-0.6) was prepared by sol-gelmethod. The structure, thermal expansion coefficient and electrical properties of the solid solutions were systematically studied. XRDdata showed that a complete cubic fluorite structure was formed at 160 ℃. The purity of the product prepared by the sol gel methoDIs higher, the grain size is uniformly smaller. They were easily sintereDInto highly dense ceramic pellets at 1300 ℃. The sintering temperature was significantly lower than that by traditionally high temperature solid phase reaction method. The thermal expansion coefficient of Ce0.8 Gd0.2 O1.9 , determined from high-temperature XRDdata, is 8.125×10-6 K-1 . Impedance spectra analyses showed that the grain boundary resistance of the solid electrolyte prepared by sol-gel method was reduced or even eliminated. The conductivity of Ce0.8 Gd0.2 O1.9 is 5.26×10-3 S/cm at 600 ℃. The activation energy ( Ea) is 0.82 eV.

Key words: Solid electrolyte, Sol-gel method, Oxide ionic conductor, Ceria

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