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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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Conductivity of cerium oxides doped by trivalent cations
ZHANG Hong(张  鸿), WANG Jian (汪  健), WANG Shen-cun(王申存), LI Zhi-cheng(李志成)

School of Materials Science and Engineering, Central South University, Changsha 410083, China

Abstract:For the doping technique with single dopant of Sb2O3, Ga2O3, In2O3, AlCl3, Bi2O3 or Sm2O3, the dopant concentrations of 10%(molar fraction) were selected for the CeO2-based oxygen-ion conductors. A wet chemical method by polymerization of polyvinyl-alcohol was performed for the compound preparation. X-ray diffraction analysis result shows that the calcined powders have nanocrystalline structure with grain size less than 40 nm, and the sintered samples have pure single fluorite-type phase in all doped cerium oxides. Impedance measurement results show that the conductivities and activation energies of CeO2-based oxides depend closely on the dopants. The Sb2O3-doped CeO2 has the largest conductivity and In2O3-doped CeO2 has the lowest one at 200 ℃, the Bi2O3-doped oxide shows the highest activation energy and Al2O3-doped oxide shows the lowest one. Ionic radii and association enthalpies of dopants were taken account for different conductivities and activation energies of the CeO2-based oxygen-ion conductors.

 

Key words: cerium oxides; doping technique; synthesis process; ionic conductivity; enthalpy

ISSN 1672-7029
CN 43-1423/U

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