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论文类型：期刊论文

发表时间：2015-04-04

发表刊物：FERROELECTRICS

收录刊物：EI、SCIE

卷号：478

期号：1

页面范围：26-39

ISSN号：0015-0193

关键字：defect chemical model; oxygen vacancy diffusion; electrical conductivity; Ba0.5Sr0.5Co0.8Fe0.2O3-delta; oxygen stoichiometry

摘要：Ba0.5Sr0.5Co0.8Fe0.2O3-delta is a well-known cathode material of intermediate-temperature solid oxide fuel cell. To elucidate its electrical and electrochemical properties, three chemical defect models were adopted in this work for fitting the data of oxygen stoichiometry and electrical conductivities as a function of temperature. Reasonable values of concentrations and mobility of charge carriers,
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   and
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   were obtained with the
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   cluster defect model. The p-type electronic conductivities and oxygen ionic conductivities were separated from the total electrical conductivities. The temperature-dependence of oxygen vacancy diffusion coefficient of BSCF were also obtained, and the results were comparable with the data measured experimentally.