ACS Applied Materials & Interfaces
ACS Applied Materials & Interfaces
5 years ago

Directing Oxygen Vacancy Channels in SrFeO2.5 Epitaxial Thin Films

Directing Oxygen Vacancy Channels in SrFeO2.5 Epitaxial Thin Films
Amit Khare, Seulki Roh, Takayoshi Katase, Jaekwang Lee, Si-Young Choi, Hiromichi Ohta, Junwoo Son, Tae Sup Yoo, Jaeseoung Park, Jungseek Hwang, Gi-Yeop Kim, Woo Seok Choi
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.

Publisher URL: http://dx.doi.org/10.1021/acsami.7b17377

DOI: 10.1021/acsami.7b17377

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