Atomic-resolution imaging of electrically induced oxygen vacancy migration and phase transformation in SrCoO2.5-σ

Qinghua Zhang, Xu He, Jinan Shi, Nianpeng Lu, Haobo Li, Qian Yu (), Ze Zhang, Long-Qing Chen, Bill Morris, Qiang Xu, Pu Yu, Lin Gu (), Kuijuan Jin and Ce-Wen Nan ()
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Qinghua Zhang: Chinese Academy of Sciences
Xu He: Chinese Academy of Sciences
Jinan Shi: Chinese Academy of Sciences
Nianpeng Lu: Tsinghua University
Haobo Li: Tsinghua University
Qian Yu: School of Materials Science and Engineering, Zhejiang University
Ze Zhang: School of Materials Science and Engineering, Zhejiang University
Long-Qing Chen: The Pennsylvania State University
Bill Morris: UC Berkeley
Qiang Xu: DENSsolutions
Pu Yu: Tsinghua University
Lin Gu: Chinese Academy of Sciences
Kuijuan Jin: Chinese Academy of Sciences
Ce-Wen Nan: Tsinghua University

Nature Communications, 2017, vol. 8, issue 1, 1-6

Abstract: Abstract Oxygen ion transport is the key issue in redox processes. Visualizing the process of oxygen ion migration with atomic resolution is highly desirable for designing novel devices such as oxidation catalysts, oxygen permeation membranes, and solid oxide fuel cells. Here we show the process of electrically induced oxygen migration and subsequent reconstructive structural transformation in a SrCoO2.5−σ film by scanning transmission electron microscopy. We find that the extraction of oxygen from every second SrO layer occurs gradually under an electrical bias; beyond a critical voltage, the brownmillerite units collapse abruptly and evolve into a periodic nano-twined phase with a high c/a ratio and distorted tetrahedra. Our results show that oxygen vacancy rows are not only natural oxygen diffusion channels, but also preferred sites for the induced oxygen vacancies. These direct experimental results of oxygen migration may provide a common mechanism for the electrically induced structural evolution of oxides.

Date: 2017
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DOI: 10.1038/s41467-017-00121-6

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