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Chemical Research in Chinese Universities ›› 2012, Vol. 28 ›› Issue (1): 9-13.

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Effects of MoO3 Amounts on Sintering and Electrical Properties of Ce0.8Nd0.2O1.9

ZHOU De-feng1*, ZHAO Gui-chun1, YANG Mei1, XIA Yan-jie2, MENG Jian2   

  1. 1. School of Chemistry and Life Science, Changchun University of Technology, Changchun 130012, P. R. China;
    2. State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China
  • Received:2010-12-14 Revised:2011-06-13 Online:2012-01-25 Published:2011-12-27
  • Supported by:

    Supported by the National Natural Science Foundation of China(No.20871023) and the Jilin Provincial Science Research Foundation, China(Nos.20070510, 20101549).

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Abstract: The high purity (Ce0.8Nd0.2O1.9)1-x(MoO3)x(x=0, 0.005, 0.010, 0.020; Ce0.8Nd0.2O1.9=NDC) solid solutions were prepared by modified sol-gel method. The structures and electric conductivities were characterized by X-ray diffraction(XRD), field-emission scanning electron microscopy(FESEM) and electrochemical impedance spectroscopy( EIS). The XRD results show that the materials were pure phase with a cubic fluorite structure. Compared to the undoped-NDC samples, MoO3 doped-NDC showed higher sintered density(over 96%) at reduced sintering temperature. The electric conductivity(σt) of (Ce0.8Nd0.2O1.9)1-x(MoO3)x at 400 ℃ was 9.58×10–4 S/cm when x=0.010, which was higher than that of undoped-NDC samples(σt=3.29×10–4 S/cm). The obtained optimal amount of the MoO3 was x=0.010 in this system.

Key words: Neodymium-doped ceria, Molybdenum oxide, Sol-gel method, Grain boundary conductivity