高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

Mo掺杂对高纯Ce1-xNdxO2-x/2(x=0.10, 0.15)体系烧结温度及晶界电性能的影响

周德凤1, 朱建新1, 夏燕杰1, 于丹1, 孟健2   

    1. 长春工业大学生物工程学院, 长春 130012;
    2. 中国科学院长春应用化学研究所稀土化学与物理重点实验室, 长春 130022
  • 收稿日期:2007-12-23 修回日期:1900-01-01 出版日期:2008-09-10 发布日期:2008-09-10
  • 通讯作者: 周德凤

Effects of Mo-dopant on Sintering Temperature and Grain Boundary Conductivity of High-purity Ce1-xNdxO2-x/2(x=0.10, 0.15) Systems

ZHOU De-Feng1*, ZHU Jian-Xin1, XIA Yan-Jie1, YU Dan1, MENG Jian2   

    1. School of Biological Engineering, Changchun University of Technology, Changchun 130012, China;
    2. Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
  • Received:2007-12-23 Revised:1900-01-01 Online:2008-09-10 Published:2008-09-10
  • Contact: ZHOU De-Feng

PDF (PC)

摘要： 用柠檬酸硝酸盐法制备高纯Ce1-xNdxO2-x/2(x=0.10, 0.15)固溶体, 加入摩尔分数为5%的Mo, 研究了Mo掺杂对烧结温度、结构及电性能的影响. 通过X射线衍射、电感偶合等离子体和场发射扫描电镜等手段对氧化物进行了结构表征, 采用交流阻抗谱测试其电性能. 柠檬酸硝酸盐法制备的前驱体经1450 ℃烧结24 h得到致密度大于96%的陶瓷材料; 加入5%Mo, 在1250 ℃下烧结8 h即可达到理想的致密度(>95%). 加入Mo在烧结过程中可加快晶界迁移, 促进晶粒生长, 显著提高了晶界电导率. 在600 ℃时Ce0.85Nd0.15O1.925的晶界电导率为2.56 S/m, 加入Mo后材料的电导率增加到5.62 S/m.

关键词: 固体电解质, 电导率, 晶界, 掺杂

Abstract: The pure Ce1-xNdxO2-x/2(x=0.10, 0.15) solid solutions were synthesized via citric-nitrate method and the effects of 5%(molar fraction) Mo-dopant on the sintering temperature and grain boundary conductivities of the Ce1-xNdxO2-x/2(x=0.10, 0.15) were discussed. Their structures and ionic conductivities were characterized via X-ray Diffraction(XRD), Inductively Coupled Plasma(ICP), field-emission scanning electron microscopy(FE-SEM) and electrochemical impedance spectroscopy(EIS). The results show that the precurors synthesized via citric-nitrate method have a good sinterability with relative density of >96% after being sintered at 1450 ℃ for 24 h. With Mo-dopant, the relative density of >95% was reached after being sintered at 1250 ℃ for 8 h and the grain boundary conductivity increased greatly because of the increase of grain size. The grain boundary conductivty at 600 ℃ for Ce0.85Nd0.15O1.925 increased from 2.56 S/m to 5.62 S/m with Mo-dopant.

Key words: Solid state electrolyte, Conductivity, Grain boundary, Doping

中图分类号: 

TrendMD: