Abstract
Lanthanum ferrites with high mixed ionic and electronic conductivities are promising materials for solid oxide fuel cell (SOFC) cathodes. A-site deficient calcium-doped lanthanum ferrite (LCF) powders were synthesized and tested to characterize their electrochemical properties for use as cathode materials in single-step cofired SOFCs. Four-probe conductivity and oxygen permeability tests indicate superior mixed ionic and electronic conductivities compared to conventional SOFC cathode materials. Thermogravimetric data measured as a function of temperature and oxygen partial pressure (PO 2 ) along with the conductivity and permeability measurements were consistent with the defect model of LCF.
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