高等学校化学学报

高等学校化学学报 ›› 1999, Vol. 20 ›› Issue (5): 684.

• 论文 • 上一篇    下一篇

纳米晶(CeO2)1-x(BiO1.5)x固溶体的水热合成与离子输运性质研究

李广社1, 毛雅春2, 李莉萍3, 冯守华2, 汪敏强1, 姚熹1   

  1. 1. 西安交通大学电子材料研究所, 西安 710049;
    2. 吉林大学无机合成与制备化学开放实验室, 长春 130023;
    3. 吉林大学物理系固体物理教研室, 长春 130023
  • 出版日期:1999-05-24 发布日期:1999-05-24
  • 通讯作者: 李广社,男,31岁,博士.
  • 作者简介:李广社,男,31岁,博士.
  • 基金资助:

    国家自然科学基金(批准号:19804005);中国博士后科学基金(No.6570);吉林大学无机合成开放实验室开放基金(No.383B1)资助课题

Hydrothermal Synthesis and Transport Properties of Nanocrystalline (CeO2)1-x(BiO1.5)xSolid Solution

LI Guang-She1, MAO Ya-Chun2, LI Li-Ping3, FENG Shou-Hua2, WANG Min-Qiang1, YAO Xi1   

  1. 1. Institute of Electronic Materials Research, Xi′an Jiaotong University, Xi′an, 710049;
    2. Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun, 130023;
    3. Department of Physics, Jilin University, Changchun, 130023
  • Online:1999-05-24 Published:1999-05-24

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摘要： 在240℃水热体系中首次合成出系列纳米晶固溶体(CeO2)1-x(BiO1.5)x(x=0.0～0.50).产物采用X射线衍射,扫描电子显微镜和X射线光电子能谱仪进行表征.Bi2O3在CeO2中的固溶限约为50%.所有固溶体结晶属立方萤石结构,粒度范围为10～18nm.当Bi2O3掺杂量小于固溶限时,于800℃烧结不会导致结构转变.而对于(CeO2)0.5(BiO1.5)0.5,于800℃在空气中烧结将导致固溶限降低.Bi2O3含量低于固溶限时,固溶体只具有体电导,而(CeO2)0.6(BiO1.5)0.4的总电导可分为体电导和晶界电导.体电导为氧离子,而晶界为来自电极的银离子.

关键词: 结构特征, 输运性质, 纳米晶

Abstract: By means of XRD and XPS measurements, the structural characteristics and valence states of a series of nanocrystalline solid solutions(CeO2)1-x(BiO1.5)x(x =0.0～0.50) synthesized under mild hydrothermal conditions at 240 ℃ were investigated. The solution limit of Bi2O3in ceria is as high as ca . 50 %. XRD data showed that all solid solutions crystallized in single phase cubic fluorite type structure. This result is different from the solid state reaction routes. The average grain size of all solid solutions was within a narrower range of 10～18 nm. XPS data gave evidence of the presence of Bi(Ⅲ) and Ce(Ⅳ) in all doped ceria. When the content of dopant Bi2O3in ceria was lower than the limit, air firing of the as made doped ceria up to 800 ℃ did not lead to any structural transformation. For the solid solution of (CeO2)0.5(BiO1.5)0.5, sintering it in air at 800 ℃ would cause the limit exceeded as well as segregation of an unknown phase. The ionic conduction measured by impedance spectroscopy showed that the solid solutions with bismuth content lower than the limit exhibited only the bulk conduction. The bulk conduction of solution(CeO2)0.6(BiO1.5)0.4was due to oxide ions and the grain boundary to silver from the electrode.

Key words: Structural characteristics, Transport properties, Nanocrystalline

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