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化学学报
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化学学报 ›› 2007, Vol. 65 ›› Issue (10): 989-993. 上一篇    下一篇

研究论文

Ce1－xNdxO2－δ固溶体的电子顺磁共振谱和阻抗谱的研究

林晓敏*,1,2, 李莉萍2, 苏文辉3,4   

  1. (1北华大学物理学院 吉林 132013)
    (2吉林大学物理学院 长春 130023)
    (3哈尔滨工业大学理学院 哈尔滨 150001)
    (4中国科学院国际材料物理中心 沈阳 110015)
  • 投稿日期:2006-08-25 修回日期:2006-11-10 发布日期:2007-05-28
  • 通讯作者: 林晓敏

Study of Electron Paramagnetic Resonance Spectra and Impedance Spectra for the Solid Solutions Ce1－xNdxO2－δ

LIN Xiao-Min*,1,2; LI Li-Ping2; SU Wen-Hui3,4   

  1. (1 Department of Physics, Beihua University, Jilin 132013)
    (2 Department of Physics, Jilin University, Changchun 130023)
    (3 Department of Physics, Haerbin University, Haerbin 150001)
    (4 Center of International Material Physics Reserch, Chinese Academy of Sciences, Shengyang 110015)
  • Received:2006-08-25 Revised:2006-11-10 Published:2007-05-28
  • Contact: LIN Xiao-Min

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利用溶胶-凝胶方法在800 ℃焙烧10 h后, 合成了固溶体Ce1－xNdxO2－δ (x＝0.05～0.55), X射线衍射(XRD)测试表明固溶体已经形成立方萤石结构; 电子顺磁共振谱(EPR)研究表明在固溶体Ce1－xNdxO2－δ中随着掺杂量x的增大, Ce3＋离子含量减少, 说明掺杂Nd3＋离子可以抑制Ce4＋的还原; 交流阻抗谱的测量表明固溶体Ce0.9Nd0.1O2－d 具有离子导电特性, 600和700 ℃时的电导率分别为4.25×10－3和1.12×10－2 S•cm－1, 活化能为0.68 eV.

关键词: 溶胶-凝胶方法, 固溶体Ce1－xNdxO2－δ, EPR谱, 电导率

Solid solutions Ce1－xNdxO2－δ (x＝0.05～0.55) were prepared by sintering the gel at 800 ℃ for 10 h by sol-gel method. XRD showed that solid solutions Ce1－xNdxO2－δ were crystallized in a cubic fluorite structure. The electron paramagnetic resonance spectra suggested that the content of Ce3＋ ions is decreased with the increasing dopant content x in the solid solutions Ce1－xNdxO2－δ, which suggested that doping with lower valence Nd3＋ ions may control the redox of Ce4＋ ions in the solid solutions. The impedance spectra of the solid solutions showed ionic conduction. The conductivities of Ce0.9Nd0.1O2－δ were 4.25×10－3 and 1.12×10－2 S•cm－1 at 600 and 700 ℃ respectively, and activation energy was 0.82 eV.

Key words: sol-gel method, solid solution Ce1－xNdxO2－δ, EPR spectrum, conductivity