Conductivity of cerium oxides doped by trivalent cations
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.
cerium oxides doping technique synthesis process ionic conductivity enthalpy
ZHANG Hong WANG Jian WANG Shen-cun LI Zhi-cheng
School of Materials Science and Engineering,Central South University,Changsha 410083,China
国际会议
2007年国际有色金属大会(International Conference of Nonfereous Materials 2007)(ICNFM)
长沙
英文
2007-11-28（万方平台首次上网日期，不代表论文的发表时间）