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Indexed by:期刊论文

Date of Publication:2015-04-04

Journal:FERROELECTRICS

Included Journals:EI、SCIE

Volume:478

Issue:1

Page Number:26-39

ISSN No.:0015-0193

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

Abstract: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.