Journal
NANO LETTERS
Volume 20, Issue 11, Pages 8353-8359Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c03516
Keywords
oxygen vacancy channel; double perovskites; phase transition; in situ transmission electron microscopy
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Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [NRF-2016M3D1A1900035, NRF-2018R1A2B6008104, NRF-2018R1A2A1A05077532, NRF-2018R1A2B2002875]
- Samsung Research Funding & Incubation Center of Samsung Electronics [SRFC-MA1702-01]
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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.
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