高等学校化学学报

高等学校化学学报 ›› 2011, Vol. 32 ›› Issue (2): 231.

• 研究论文 • 上一篇    下一篇

Ce0.8Gd0.2–xPrxO1.9固溶体的合成与表征

林晓敏1, 孙嘉苓1, 闫石1, 朱丽丽1, 苏文辉2,3   

  1. 1. 北华大学物理学院,  吉林 132013;
    2. 吉林大学物理学院,  长春 130012;[JZ]
    3. 哈尔滨工业大学凝聚态科学与技术中心,  哈尔滨 150001
  • 收稿日期:2010-06-02 修回日期:2010-11-20 出版日期:2010-02-10 发布日期:2011-02-23
  • 通讯作者: 林晓敏 E-mail:linxiaomin1964@yahoo.com.cn
  • 基金资助:

    国家自然科学基金(批准号: 10374022)和吉林省教育厅科研基金(批准号: 201167)资助.

Synthesis and Characterization of Solid Solution Ce0.8Gd0.2–xPrxO1.9

LIN Xiao-Min1*,  SHUN Jia-Ling1,  YAN Shi1, ZHU Li-Li1,  SU Wen-Hui2,3   

  1. 1. College of Physics,  Beihua University,   Jilin 132013,  China;
    2. College of Physics,  Jilin University,  Changchun 130012,  China;
    3. Center of Condensed Matter Science and Technology,  Harbin Institute of Technology,  Harbin 150001,  China
  • Received:2010-06-02 Revised:2010-11-20 Online:2010-02-10 Published:2011-02-23
  • Contact: LIN Xiao-Min E-mail:linxiaomin1964@yahoo.com.cn
  • Supported by:

    国家自然科学基金(批准号: 10374022)和吉林省教育厅科研基金(批准号: 201167)资助.

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摘要： 摘要 利用X射线衍射（XRD），拉曼光谱(Raman), X射线光电子能谱(XPS)和交流阻抗谱对溶胶–凝胶法制备的稀土双掺杂Ce0.8Gd0.2–xPrxO1.9 (x=0, 0.02, 0.10)固溶体的结构和导电性进行了研究. XRD结果表明经800 ℃焙烧所有样品都形成了单相立方萤石结构，平均晶粒为23–30nm之间；XPS结果表明样品中镨离子以混合价态Pr3+和Pr4+存在；Raman谱结果表明Ce0.8Gd0.2–xPrxO1.9(x=0, 0.02, 0.10)具有氧缺位的立方萤石结构，Pr离子的掺杂有利于氧缺位增加； 阻抗谱表明稀土双掺杂Ce0.8Gd0.2–xPrxO1.9 (x=0.02, 0.10)的电导率高于稀土单掺样品Ce0.8Gd0.2O1.9(σ600oc =1.62×10–3 S.cm–-1)，Ce0.8Gd0.10Pr0.10O1.9的电导率最大(σ600oc = 6.15×10–3 S.cm–-1，导电活化能Ea=0.64eV (<400℃), Ea=0.82eV（>400℃），这与材料内部更多的氧离子缺位和小极化子电子导电有关.  

关键词: 溶胶–凝胶法, Ce0.8Gd0.2–xPrxO1.9 固溶体, X射线光电子能谱, 拉曼光谱, 电导率

Abstract: Abstract The structure and conductivity of rare earth co-doped ceria Ce0.8Gd0.2–xPrxO1.9 (x=0, 0.02, 0.10) solid solutions synthesized by sol-gel method were characterized by X-ray diffraction , Raman , X-ray photoelectron spectroscopy and Impedance spectra. XRD measurement showed that all powders calcined at 800 ℃ crystallized in single cubic fluorite structure . The average grain sizes were between 23nm and 30 nm. X-ray photoelectron spectroscopy analysis suggested that the mixed valence Pr3+ and Pr4+ ions coexisted in the solid solutions. The Raman spectra analysed that the solid solution Ce0.8Gd0.2–xPrxO1.9 were cubic fluorite structure with the oxygen vacancies.The oxygen vacancy concentration could be increased by doped Pr in Ce0.8Gd0.2–xPrxO1.9. Impedance spectra showed that conductivity of rare earth co-doped ceria Ce0.8Gd0.2–xPrxO1.9 (x=0.02, 0.10) was higher than that of single rare earth doped ceria Ce0.8Gd0.2O1.9(σ600oc =1.62×10–3 S.cm–-1). Ce0.8Gd0.10Pr0.10O1.9 possessed maximum conductivity. At 600℃, the conductivity was 6.15×10–3 S.cm–1 and Ea=0.64eV (<400℃), Ea=0.82eV（>400℃），which was assigned to higher oxygen vacancy concentratin and the hopping electron transition of small polaron in Ce0.8Gd0.2–xPrxO1.9 samples.

Key words: sol-gel method, Ce0.8Gd0.2-xPrxO1.9 solid solution, X-ray photoelectron spectroscopy, Raman spectrum, conductivity

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