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

Author

Listed:
  • Qinghua Zhang

    (Chinese Academy of Sciences
    Tsinghua University)

  • 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
    Collaborative Innovation Center of Quantum Matter
    RIKEN Center for Emergent Matter Science (CEMS))

  • Lin Gu

    (Chinese Academy of Sciences
    Collaborative Innovation Center of Quantum Matter
    University of Chinese Academy of Sciences)

  • Kuijuan Jin

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Ce-Wen Nan

    (Tsinghua University)

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.

Suggested Citation

  • 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 & Ce-Wen Nan, 2017. "Atomic-resolution imaging of electrically induced oxygen vacancy migration and phase transformation in SrCoO2.5-σ," Nature Communications, Nature, vol. 8(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_s41467-017-00121-6
    DOI: 10.1038/s41467-017-00121-6
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    Cited by:

    1. Zhenzhong Yang & Le Wang & Jeffrey A. Dhas & Mark H. Engelhard & Mark E. Bowden & Wen Liu & Zihua Zhu & Chongmin Wang & Scott A. Chambers & Peter V. Sushko & Yingge Du, 2023. "Guided anisotropic oxygen transport in vacancy ordered oxides," Nature Communications, Nature, vol. 14(1), pages 1-9, December.

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