Abstract
The point defect concentrations of Ba1-xLa0xFeO3-δ perovskites, which are potential cathode materials in protonic ceramic fuel cells (PCFC), are determined by thermogravimetry. No evidence of proton-proton defect interaction is found. The O stoichiometry clearly deviates from ideal behavior, and the presence of electronic defects also modifies the hydration thermodynamics. Qualitatively, this behavior is assigned to a partial delocalization of electron holes to oxide ions adjacent to the Fe4+ ions.
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