Relation of phase fields and structural transitions to oxygen loss in reversible solid oxide cell electrodes based on SrFeO3-d
Perovskites based on SrFeO3-d (SF) are the focus of considerable recent attention as both positive and negative electrodes in symmetrical and reversible solid oxide fuel cells. Substitution of Fe for Mo in SrFeO3-d (SFM) stabilizes the cubic XRD phase at room temperature and improves electron-hole conductivity. Encouragingly, little difference in polarization resistance is observed under dc bias and operating temperature between the SF and SFM phases and the well-known Co-based perovskites with higher thermal expansion, as we recently demonstrated (J. Power Sources 437 (2019) 226895). We propose to study the phase fields and transition temperatures of the SF and SFM phases under air in the temperature range 25-900 °C and relate oxygen content with the phase transitions and oxide-ionic and electronic conductivity. The excellent resolution and data quality at D2B will reveal structural features of the oxygen sublattice which are not accessible by other means.
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MATHER Glenn; AMADOR Ulises and RITTER Clemens. (2020). Relation of phase fields and structural transitions to oxygen loss in reversible solid oxide cell electrodes based on SrFeO3-d. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-21-1132
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