닫기

연구

Research Outcome

미래를 창조하는 포스텍 화학공학과

Probing One-Dimensional Oxygen Vacancy Channels Driven by Cation-Anion Double Ordering in Perovskites

Title of paper
Probing One-Dimensional Oxygen Vacancy Channels Driven by Cation-Anion Double Ordering in Perovskites
Author
[한정우교수 연구실] 페로브스카이트에서의 1차원 산소공공 채널 규명
Publication in journal
Nano Letters 20 (2020) pp8353-8359
Publication date
20201111

 

[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–Ov (oxygen vacancy) sites. These findings could provide robust guidance for understanding the static and dynamic behaviors of oxygen vacancies in perovskite oxides.
 

DOI: doi.org/10.1021/acs.nanolett.0c03516

LINK: https://pubs.acs.org/doi/10.1021/acs.nanolett.0c03516