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

• DOI: 10.1021/acs.nanolett.0c03516
• Publication Date: 2020-10-28T11:43:01Z
• Authors: Ohhun Kwon; Yong In Kim; Kyeounghak Kim; Jong Chan Kim; Jong Hoon Lee; Sung Soo Park; Jeong Woo Han; Young-Min Kim; Guntae Kim; Hu Young Jeong
• Keywords: 01 natural sciences; 0104 chemical sciences

Visualizing the oxygen vacancy distributions is highly desirable for understanding atomistic diffusion mechanisms in perovskites. In particular, direct observation of one-dimensional channels has not yet been achieved perovskites with dual ion (i.e., cation and anion) ordering. Here, we perform atomic-resolution imaging their structural dynamics a NdBaCo2O5.5 double perovskite oxide. An situ heating transmission electron microscopy investigation reveals disordering by local rearrangement vacancies at specific temperature. A density functional theory calculation suggests that possible pathway migration multistep route via Co–O Nd–Ov (oxygen vacancy) sites. These findings could provide robust guidance static dynamic behaviors oxides.