物理化学学报 >> 2009, Vol. 25 >> Issue (07): 1415-1420.doi: 10.3866/PKU.WHXB20090716

研究论文 上一篇    下一篇

(Ce0.9Nd0.1)1-xMoxO2-δ (0.00≤x≤0.10)的合成、表征与电性能

夏燕杰, 周德凤, 孟健   

  1. 长春工业大学化学与生命科学学院, 长春 130012|中国科学院长春应用化学研究所, 稀土化学与物理国家重点实验室, 长春 130022
  • 收稿日期:2008-12-04 修回日期:2009-03-31 发布日期:2009-06-26
  • 通讯作者: 周德凤, 孟健 E-mail:defengzhou65@126.com; jmeng@ciac.jl.cn

Synthesis, Characterization and Electrical Properties of (Ce 0.9Nd0.1)1-xMoxO2-δ(0.00≤x≤0.10)

XIA Yan-Jie, ZHOU De-Feng, MENG Jian   

  1. School of Chemistry and Life Science, Changchun University of Technology, Changchun 130012, P. R. China|Key Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China
  • Received:2008-12-04 Revised:2009-03-31 Published:2009-06-26
  • Contact: ZHOU De-Feng, MENG Jian E-mail:defengzhou65@126.com; jmeng@ciac.jl.cn

摘要:

采用溶胶-凝胶法合成(Ce0.9Nd0.1)1-xMoxO2-δ(x=0.00、0.02、0.05、0.10)氧化物, 通过X射线衍射(XRD)、场发射扫描电镜(FESEM)等手段对氧化物进行结构表征, 交流阻抗谱测试电性能. 结果表明: 所有样品均为单一萤石立方结构; 少量MoO3的加入提高了材料的致密性, 降低了材料的总电阻、晶界电阻和晶界电阻在总电阻中所占比例, 提高了材料的电导率. 1200 ℃烧结样品24 h, 测试温度700 ℃时, (Ce0.9Nd0.1)1-xMoxO2-δ(x=0.00)总电导率和晶界电导率分别为0.05和0.19 S·m-1, 掺Mo材料(Ce0.9Nd0.1)1-xMoxO2-δ(x=0.02)的总电导率和晶界电导率分别为2.42 和3.96 S·m-1.

关键词: 钕掺杂氧化铈, 氧化钼, 微观结构, 晶界电导率

Abstract:

(Ce0.9Nd0.1)1-xMoxO2-δ(x=0.00, 0.02, 0.05, 0.10) were prepared by a modified sol-gel method. Sample structures were characterized by X-ray diffraction (XRD) and field-emission scanning electron microscopy (FESEM). The ionic conductivity was systematically studied over a temperature range from 350 to 800 ℃ in air using impedance spectroscopy. Results showed that the materials were single phase with a cubic fluorite structure. A higher relative density was obtained for (Ce0.9Nd0.1)0.98Mo0.02O2-δsintered at 1200 ℃ for 24 h compared to the relative density of Ce0.9Nd0.1O2-δ. Impedance spectroscopy showed a sharp increase in conductivity for the ceria system that contained a small amount of MoO3. The solution (Ce0.9Nd0.1)0.98Mo0.02O2-δ was shown to be the best conducting phase as it had the highest conductivity (total conductivity (σt) is 2.42 S·m-1, grain boundary conductivity (σGB) is 3.96 S·m-1 at 700 ℃) compared to a sample that was not doped with Mo (σt=0.05 S·m-1, σGB=0.19 S·m-1 at 700 ℃).

Key words: Neodymium-doped ceria, Molybdenumoxide, Microstructure, Grain boundary conductivity

MSC2000: 

  • O649