Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (05): 1202-1206.doi: 10.3866/PKU.WHXB20100509

• ELECTROCHEMISTRY • Previous Articles     Next Articles

Structure and Electrical Properties of MgO-Doped Ce0.9Sm0.1O2-δ Based Solid Electrolytes

NING De-Zheng, ZHOU De-Feng, XIA Yan-Jie, ZHAO Gui-Chun, MENG Jian   

  1. School of Chemistry and Life Science, Changchun University of Technology, Changchun 130012, P. R. China; State Key Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China
  • Received:2009-10-21 Revised:2009-12-18 Published:2010-04-29
  • Contact: ZHOU De-Feng E-mail:defengzhou65@126.com; jmeng@ciac.jl.cn

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Abstract:

The precursor powder of Ce0.9Sm0.1O2-δ(SDC) containing 5.0×10-4 (w) SiO2 as an impurity (SDCSi) was prepared by the sol-gelmethod and 0-3.0%(molar fraction, x)MgOwas added to the SDCSi powder. The characterizations focused on phase structure, sintering behavior, relative density, electrical conductivity of all the samples were investigated by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and AC impedance spectroscopy. We find that MgO can reduce the sintering temperature about 100-200 ℃ and increase the relative density of the ceramics. The grain boundary conduction increased markedly for the 1.0%(x) MgO-loaded SDCSi ceramics as MgO can mitigate the harmful effects of the SiO2 impurity. These investigations have indicated that MgO is shown to be an effective sintering aid and a new scavenger of the grain boundary synchronously.

Key words: Solid electrolyte, MgO-doping, Scavenger, Electrical conductivity