Synthesis and Electrical Properties of La0.8Sr0.2-xCa xCo0.9Fe0.1O3-δ
来源期刊：JOURNAL OF RARE EARTHS2003年第1期
论文作者：崔衡 马文会 张雄飞 陈书荣 谢刚
Key words：material physical chemistry; solid reaction synthesis; compositely doped material; solid oxide fuel cells; rare earths;
Abstract: Effects of small amount of Ca doping in La site in LaCoO3-based oxide on the synthesis and electrical conductivity were investigated by using X-ray diffraction (XRD), differential scanning calorimetry and thermogravimetry (DSC/TG), ordinary four-probe dc measurement methods. La0.8Sr0.2-xCaxCo0.9Fe0.1O3-δ (LSCCF, 0≤x≤0.1) prepared by solid reaction synthesis is all of a single phase and the calcined process may be divided into three stages: (1) decomposition of reactants; (2) formation of LaCoO3-based oxides; and (3) formation of LSCCF solid solution. The maximum of electrical conductivity of the LSCCF composites is above 100 S*cm-1 and the conduction mechanism is attributed to the adiabatic-hopping of p-type small polarons.
崔衡1，马文会1，张雄飞1，陈书荣1，谢刚1
(1.Faculty of Materials and Metallurgy Engineering, Kunming University of Science and Technology, Kunming 650093, China)
Abstract:Effects of small amount of Ca doping in La site in LaCoO3-based oxide on the synthesis and electrical conductivity were investigated by using X-ray diffraction (XRD), differential scanning calorimetry and thermogravimetry (DSC/TG), ordinary four-probe dc measurement methods. La0.8Sr0.2-xCaxCo0.9Fe0.1O3-δ (LSCCF, 0≤x≤0.1) prepared by solid reaction synthesis is all of a single phase and the calcined process may be divided into three stages: (1) decomposition of reactants; (2) formation of LaCoO3-based oxides; and (3) formation of LSCCF solid solution. The maximum of electrical conductivity of the LSCCF composites is above 100 S*cm-1 and the conduction mechanism is attributed to the adiabatic-hopping of p-type small polarons.
Key words:material physical chemistry; solid reaction synthesis; compositely doped material; solid oxide fuel cells; rare earths;
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