Electrical Properties of La0.8Sr0.2Co1-yFeyO3-δ for SOFC Cathodes
来源期刊：Journal of Rare Earths2007年第S1期
论文作者：于洁 马文会 王华 戴永年 何天淳
文章页码：387 - 390
摘 要：La0.8Sr0.2Co1-yFeyO3-δ （y=0.2, 0.4, 0.6, 0.8） powders were synthesized by ethylenediamine tetraacetic acid （EDTA） complexing sol-gel process. The powders were characterized via X-ray diffraction （XRD） and scanning electron microscope and energy dispersive X-ray spectroscopy （SEM-EDS）. The results showed that single-phased perovskite-type oxide powders with small particle size were obtained by the process, and the compositions of the productions agreed with the designed molar ratio. The electronic conductivity and ionic conductivity of La0.8Sr0.2Co1-yFeyO3-δ were investigated by DC four-terminal method and AC impedance spectroscopy, respectively. The electronic conductivity of La0.8Sr0.2Co1-yFeyO3-δ is approximately 2～4 orders of magnitude higher than the ionic conductivity. It was confirmed that the conductivities of the materials were strongly influenced by the composition anions, temperature and sample preparing process.
于洁，马文会，王华，戴永年，何天淳
摘 要：La0.8Sr0.2Co1-yFeyO3-δ （y=0.2, 0.4, 0.6, 0.8） powders were synthesized by ethylenediamine tetraacetic acid （EDTA） complexing sol-gel process. The powders were characterized via X-ray diffraction （XRD） and scanning electron microscope and energy dispersive X-ray spectroscopy （SEM-EDS）. The results showed that single-phased perovskite-type oxide powders with small particle size were obtained by the process, and the compositions of the productions agreed with the designed molar ratio. The electronic conductivity and ionic conductivity of La0.8Sr0.2Co1-yFeyO3-δ were investigated by DC four-terminal method and AC impedance spectroscopy, respectively. The electronic conductivity of La0.8Sr0.2Co1-yFeyO3-δ is approximately 2～4 orders of magnitude higher than the ionic conductivity. It was confirmed that the conductivities of the materials were strongly influenced by the composition anions, temperature and sample preparing process.
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