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

Journal Article · · Nature Communications
 [1];  [2];  [2];  [3];  [3];  [4];  [4];  [5];  [6];  [7];  [8];  [9];  [10];  [11]
  1. Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics, Inst. of Physics; Tsinghua Univ., Beijing (China). School of Materials Science and Engineering
  2. Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics, Inst. of Physics
  3. Tsinghua Univ., Beijing (China). State Key Lab. of Low-Dimensional Quantum Physics
  4. Zhejiang Univ., Hangzhou (China).. Center of Electron Microscopy and State Key Lab. of Silicon Materials
  5. Pennsylvania State Univ., University Park, PA (United States). Dept. of Materials Science and Engineering
  6. Univ. of California, Berkeley, CA (United States). Dept. of Materials Science and Engineering
  7. DENSsolutions, Delft (The Netherlands)
  8. Tsinghua Univ., Beijing (China). State Key Lab. of Low-Dimensional Quantum Physics; Collaborative Innovation Center of Quantum Matter, Beijing (China); RIKEN, Saitama (Japan). Center for Emergent Matter Science (CEMS)
  9. Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics, Inst. of Physics; Collaborative Innovation Center of Quantum Matter, Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China). School of Physical Sciences
  10. Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics, Inst. of Physics; Univ. of Chinese Academy of Sciences, Beijing (China). School of Physical Sciences
  11. Tsinghua Univ., Beijing (China). School of Materials Science and Engineering

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. 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. These 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.

Research Organization:
Pennsylvania State Univ., University Park, PA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-07ER46417
OSTI ID:
1392943
Journal Information:
Nature Communications, Vol. 8, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 55 works
Citation information provided by
Web of Science

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Controlling the Magnetic Properties of LaMnO 3 /SrTiO 3 Heterostructures by Stoichiometry and Electronic Reconstruction: Atomic‐Scale Evidence journal May 2019
Electric‐Field‐Controlled Antiferromagnetic Spintronic Devices journal March 2020
Edge‐Exposed Molybdenum Disulfide with N‐Doped Carbon Hybridization: A Hierarchical Hollow Electrocatalyst for Carbon Dioxide Reduction journal March 2019
Large Electric‐Field‐Induced Strain Close to the Surface in Barium Titanate Studied by Atomic‐Scale In Situ Electron Microscopy journal November 2019
Electronic structure evolutions driven by oxygen vacancy in SrCoO3−x films journal March 2019
Methods for Calibration of Specimen Temperature During In Situ Transmission Electron Microscopy Experiments journal January 2020
Three-dimensional atomic-scale observation of structural evolution of cathode material in a working all-solid-state battery journal August 2018
Evidence for the dynamic relaxation behavior of oxygen vacancies in Aurivillius Bi 2 MoO 6 from dielectric spectroscopy during resistance switching journal January 2019
Oxygen vacancy induced electronic structure variation in the La 0.2 Sr 0.8 MnO 3 thin film journal May 2019
Brownmillerite phase formation and evolution in epitaxial strontium ferrite heterostructures journal June 2019
Disentangling Highly Asymmetric Magnetoelectric Effects in Engineered Multiferroic Heterostructures journal July 2019
Perpendicular magnetic anisotropy in L a 1 x S r x Co O 2.5 + δ / L a 2 / 3 S r 1 / 3 Mn O 3 / L a 1 x S r x Co O 2.5 + δ trilayers ( x = 0.05 0.5 ) journal September 2019
Atomic occupancy mechanism in brownmillerite Ca 2 FeAlO 5 from a thermodynamic perspective journal August 2019
Large Electric‐Field‐Induced Strain Close to the Surface in Barium Titanate Studied by Atomic‐Scale In Situ Electron Microscopy journal November 2019