Mössbauer spectroscopy reveals how Fe's chemical state influences electrical conduction in cubic perovskite oxides, suggesting applications for solid oxide fuel cells.
Abstract Oxide materials with cubic perovskite structure and randomly distributed oxide-ion vacancies were synthesized by partially substituting Ln (Ln: Tm, Yb, Lu) for Sr or Fe in SrFeO3‑δ. Mössbauer spectroscopy showed that the Fe chemical state depended on the substitution site rather than the Ln type. Although Sr0.9Ln0.1FeO₃₋δ and SrFe0.9Ln0.1O₃₋δ exhibited similar mean Fe valence, the former demonstrated greater charge carrier delocalization, higher conductivity and lower activation energy. Notably, Sr0.9Tm0.1FeO3‑δ exhibited the highest conductivity without structural phase transition, indicating strong potential as an electrode material for solid oxide fuel cells.
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Nagai et al. (2025) studied this question.
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