| Ce1-xGdxO2-x/2的溶胶-凝胶法合成及其性质 |
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| 引用本文： | 蒋凯,彭程,李五聚,王琳,王鸿燕,梁宏伟,孟健.Ce1-xGdxO2-x/2的溶胶-凝胶法合成及其性质[J].高等学校化学学报,2001,22(8):1279-1282. |
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| 作者姓名： | 蒋凯 彭程 李五聚 王琳 王鸿燕 梁宏伟 孟健 |
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| 作者单位： | 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 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，国家自然科学基金，河南省杰出青年科学基金，河南省自然科学基金，GB1998061316，29831010,59802011，，004030300，，，， |
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| 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.
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| 关 键 词： | 固体电解质 溶胶-凝胶法 氧离子导体 CeO2 |
| 文章编号： | 0251-0790(2001)08-1279-04 |
| 收稿时间： | 2000-08-23 |
Sol-gel Synthesis and Properties of Ce1-xGdxO2-x/2 Solid Solutions |
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| JIANG Kai ,PENG Cheng ,LI Wu Ju ,WANG Lin WANG Hong Yan ,LIANG Hong Wei ,MENG Jian.Sol-gel Synthesis and Properties of Ce1-xGdxO2-x/2 Solid Solutions[J].Chemical Research In Chinese Universities,2001,22(8):1279-1282. |
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| Authors: | JIANG Kai PENG Cheng LI Wu Ju WANG Lin WANG Hong Yan LIANG Hong Wei MENG Jian |
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| Institution: | 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 |
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| 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. |
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| Keywords: | Solid electrolyte Sol gel method Oxide ionic conductor Ceria |
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