Probing One-Dimensional Oxygen Vacancy Channels Driven by Cation-Anion Double Ordering in Perovskites
- Title
- Probing One-Dimensional Oxygen Vacancy Channels Driven by Cation-Anion Double Ordering in Perovskites
- Author
- 김경학
- Keywords
- oxygen vacancy channel; double perovskites; phase transition; in situ transmission electron microscopy
- Issue Date
- 2020-10
- Publisher
- AMER CHEMICAL SOC
- Citation
- NANO LETTERS, v. 20, no. 11, page. 8353-8359
- Abstract
- Visualizing the oxygen vacancy distributions is highly desirable for understanding the atomistic oxygen diffusion mechanisms in perovskites. In particular, the direct observation of the one-dimensional oxygen vacancy channels has not yet been achieved in perovskites with dual ion (i.e., cation and anion) ordering. Here, we perform atomic-resolution imaging of the one-dimensional oxygen vacancy channels and their structural dynamics in a NdBaCo2O5.5 double perovskite oxide. An in situ heating transmission electron microscopy investigation reveals the disordering of oxygen vacancy channels by local rearrangement of oxygen vacancies at the specific temperature. A density functional theory calculation suggests that the possible pathway of oxygen vacancy migration is a multistep route via Co-O and Nd-O-v (oxygen vacancy) sites. These findings could provide robust guidance for understanding the static and dynamic behaviors of oxygen vacancies in perovskite oxides.
- URI
- https://pubs.acs.org/doi/10.1021/acs.nanolett.0c03516https://repository.hanyang.ac.kr/handle/20.500.11754/171142
- ISSN
- 1530-6984; 1530-6992
- DOI
- 10.1021/acs.nanolett.0c03516
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > CHEMICAL ENGINEERING(화학공학과) > Articles
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