Acta Phys. -Chim. Sin. ›› 2009, Vol. 25 ›› Issue (07): 1415-1420.doi: 10.3866/PKU.WHXB20090716

• ARTICLE • Previous Articles     Next Articles

Synthesis, Characterization and Electrical Properties of (Ce 0.9Nd0.1)1-xMoxO2-δ(0.00≤x≤0.10)

XIA Yan-Jie, ZHOU De-Feng, MENG Jian   

  1. School of Chemistry and Life Science, Changchun University of Technology, Changchun 130012, P. R. China|Key Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China
  • Received:2008-12-04 Revised:2009-03-31 Published:2009-06-26
  • Contact: ZHOU De-Feng, MENG Jian E-mail:defengzhou65@126.com; jmeng@ciac.jl.cn

Abstract:

(Ce0.9Nd0.1)1-xMoxO2-δ(x=0.00, 0.02, 0.05, 0.10) were prepared by a modified sol-gel method. Sample structures were characterized by X-ray diffraction (XRD) and field-emission scanning electron microscopy (FESEM). The ionic conductivity was systematically studied over a temperature range from 350 to 800 ℃ in air using impedance spectroscopy. Results showed that the materials were single phase with a cubic fluorite structure. A higher relative density was obtained for (Ce0.9Nd0.1)0.98Mo0.02O2-δsintered at 1200 ℃ for 24 h compared to the relative density of Ce0.9Nd0.1O2-δ. Impedance spectroscopy showed a sharp increase in conductivity for the ceria system that contained a small amount of MoO3. The solution (Ce0.9Nd0.1)0.98Mo0.02O2-δ was shown to be the best conducting phase as it had the highest conductivity (total conductivity (σt) is 2.42 S·m-1, grain boundary conductivity (σGB) is 3.96 S·m-1 at 700 ℃) compared to a sample that was not doped with Mo (σt=0.05 S·m-1, σGB=0.19 S·m-1 at 700 ℃).

Key words: Neodymium-doped ceria, Molybdenumoxide, Microstructure, Grain boundary conductivity

MSC2000: 

  • O649