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<p>Oxide materials with a cubic perovskite structure and randomly distributed oxide-ion vacancies were synthesized by partially substituting <i>Ln</i> (<i>Ln</i>: Tm, Yb, Lu) for Sr or Fe in SrFeO<sub>3−<i>δ</i></sub>. Mössbauer spectroscopy showed that the Fe chemical state depended on the substitution site rather than the <i>Ln</i> type. Although Sr<sub>0.9</sub><i>Ln</i><sub>0.1</sub>FeO<sub>3−<i>δ</i></sub> and SrFe<sub>0.9</sub><i>Ln</i><sub>0.1</sub>O<sub>3−<i>δ</i></sub> exhibited similar mean Fe valence, the former demonstrated greater charge carrier delocalization, higher conductivity, and lower activation energy. Notably, Sr<sub>0.9</sub>Tm<sub>0.1</sub>FeO<sub>3−<i>δ</i></sub> exhibited the highest conductivity without structural phase transition, indicating strong potential as an electrode material for solid oxide fuel cells.</p>

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Analysis of chemical state of Fe in cubic Sr1−xLnxFeO3−δ and SrFe1−xLnxO3−δ (Ln: Tm, Yb, Lu) by Mössbauer spectroscopy and its effect on electrical conduction property

  • 期刊论文

  • 发表日期：

    2025年11月11日

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  • Keina Nagai,
  • Ryutaro Maehara,
  • Takayuki Sugimoto,
  • Kosuke Shido,
  • Takuya Hashimoto,
  • Motoyuki Matsuo

摘要

Oxide materials with a 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.