Highly-conductive Cu-substituted brownmillerite with emergent 3-dimensional oxygen vacancy channels

Abstract

Lowering down oxygen content in transition-metal oxides would inevitably result in the formation of oxygen vacancies (VO●●) or novel crystal structures. In this work, we used Cu to substitute Co...

Introducing gradient Er ions and oxygen defects into SrCoO3 for regulating structural, electrical and magnetic transport properties

“…The random distribution of oxygen vacancies in the CP phase and the 180° Co–O–Co bond angles in three directions facilitate the three-dimensional transport of carriers. 39 The three-dimensional symmetry facilitates an increased overlap between the 2p orbitals of oxygen ions and 3d orbitals of cobalt ions, thereby promoting carrier transport. At x = 0.2, Sr 0.8 Er 0.2 CoO 2.635 (OT) contains only 7% Co 4+ , resulting in reduced hole carrier concentration and elevated resistivity.…”