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ACS Appl Mater Interfaces. 2018 Feb 7;10(5):4831-4837. doi: 10.1021/acsami.7b17377. Epub 2018 Jan 23.

Directing Oxygen Vacancy Channels in SrFeO2.5 Epitaxial Thin Films.

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Department of Physics, Indian Institute of Science Education of Research (IISER) , Bhopal 462 066, India.
Department of Physics, Pusan National University , Pusan 46241, Republic of Korea.
Department of Materials Science and Engineering, Pohang University of Science and Technology , Pohang 37673, Republic of Korea.
Materials Modeling and Characterization Department, Korea Institute of Materials Science , Changwon 51508, Republic of Korea.
Research Institute for Electronic Science, Hokkaido University , Sapporo 001-0020, Japan.


Transition-metal oxides (TMOs) with brownmillerite (BM) structures possess one-dimensional oxygen vacancy channels (OVCs), which play a key role in realizing high ionic conduction at low temperatures. The controllability of the vacancy channel orientation, thus, possesses a great potential for practical applications and would provide a better visualization of the diffusion pathways of ions in TMOs. In this study, the orientations of the OVCs in BM-SrFeO2.5 are stabilized along two crystallographic directions of the epitaxial thin films. The distinctively orientated phases are found to be highly stable and exhibit a considerable difference in their electronic structures and optical properties, which could be understood in terms of orbital anisotropy. The control of the OVC orientation further leads to modifications in the hydrogenation of the BM-SrFeO2.5 thin films. The results demonstrate a strong correlation between crystallographic orientations, electronic structures, and ionic motion in the BM structure.


brownmillerite; crystalline orientation; electronic structure; epitaxial thin film; optical spectroscopy


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