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Title: Ultrafast collective oxygen-vacancy flow in Ca-doped BiFeO 3

The ultrafast motion of oxygen vacancies in solids is crucial for various future applications, such as oxide electrolytes. Visualization and quantification can offer unforeseen opportunities to probe the collective dynamics of defects in crystalline solids, but little research has been conducted on oxygen vacancy electromigration using these approaches. Here, we visualize electric-field-induced creation and propagation of oxygen-vacancy-rich and -poor competing phases and their interface with optical contrast in Ca-substituted BiFeO 3 that contains a high density of mobile oxygen vacancies. We quantitatively determined the drift velocity of collective migration to be on the order of 100 μm s -1 with an activation barrier of 0.79 eV, indicating a significantly large ionic mobility of 2 x 10 -6 cm 2 s -1 V -1 at a remarkably low temperature of 390 °C. In addition, visualization enables direct observation of fluidic behavior, such as the enhancement of conduction at channel edges, which results in U-shaped viscous propagation of the phase boundary and turbulence under a reverse electric field. All of these results provide new insights into the collective motion of defects.
Authors:
 [1] ; ORCiD logo [1] ;  [1] ;  [2] ;  [3] ; ORCiD logo [4] ;  [4] ;  [5]
  1. Korea Advanced Institute of Science and Technology (KAIST), Yuseong-gu, Daejeon (Republic of Korea); Center for Lattice Defectronics, KAIST, Yuseong-gu, Daejeon (Republic of Korea)
  2. Univ. of California, Berkeley, CA (United States)
  3. Pohang Accelerator Laboratory, POSTECH, Pohang, Gyeongbuk (Republic of Korea)
  4. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  5. Korea Advanced Institute of Science and Technology (KAIST), Yuseong-gu, Daejeon (Republic of Korea); Center for Lattice Defectronics, KAIST, Yuseong-gu, Daejeon (Republic of Korea); KAIST Institute for the NanoCentury, KAIST, Yuseong-gu, Daejeon (Republic of Korea)
Publication Date:
Grant/Contract Number:
AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
NPG Asia Materials
Additional Journal Information:
Journal Volume: 10; Journal Issue: 9; Journal ID: ISSN 1884-4049
Publisher:
Nature Publishing Group Asia
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1506352

Lim, Ji Soo, Lee, Jin Hong, Park, Heung-Sik, Gao, Ran, Koo, Tae Yeong, Martin, Lane W., Ramesh, Ramamoorthy, and Yang, Chan-Ho. Ultrafast collective oxygen-vacancy flow in Ca-doped BiFeO3. United States: N. p., Web. doi:10.1038/s41427-018-0087-5.
Lim, Ji Soo, Lee, Jin Hong, Park, Heung-Sik, Gao, Ran, Koo, Tae Yeong, Martin, Lane W., Ramesh, Ramamoorthy, & Yang, Chan-Ho. Ultrafast collective oxygen-vacancy flow in Ca-doped BiFeO3. United States. doi:10.1038/s41427-018-0087-5.
Lim, Ji Soo, Lee, Jin Hong, Park, Heung-Sik, Gao, Ran, Koo, Tae Yeong, Martin, Lane W., Ramesh, Ramamoorthy, and Yang, Chan-Ho. 2018. "Ultrafast collective oxygen-vacancy flow in Ca-doped BiFeO3". United States. doi:10.1038/s41427-018-0087-5. https://www.osti.gov/servlets/purl/1506352.
@article{osti_1506352,
title = {Ultrafast collective oxygen-vacancy flow in Ca-doped BiFeO3},
author = {Lim, Ji Soo and Lee, Jin Hong and Park, Heung-Sik and Gao, Ran and Koo, Tae Yeong and Martin, Lane W. and Ramesh, Ramamoorthy and Yang, Chan-Ho},
abstractNote = {The ultrafast motion of oxygen vacancies in solids is crucial for various future applications, such as oxide electrolytes. Visualization and quantification can offer unforeseen opportunities to probe the collective dynamics of defects in crystalline solids, but little research has been conducted on oxygen vacancy electromigration using these approaches. Here, we visualize electric-field-induced creation and propagation of oxygen-vacancy-rich and -poor competing phases and their interface with optical contrast in Ca-substituted BiFeO3 that contains a high density of mobile oxygen vacancies. We quantitatively determined the drift velocity of collective migration to be on the order of 100 μm s-1 with an activation barrier of 0.79 eV, indicating a significantly large ionic mobility of 2 x 10-6 cm2 s-1 V-1 at a remarkably low temperature of 390 °C. In addition, visualization enables direct observation of fluidic behavior, such as the enhancement of conduction at channel edges, which results in U-shaped viscous propagation of the phase boundary and turbulence under a reverse electric field. All of these results provide new insights into the collective motion of defects.},
doi = {10.1038/s41427-018-0087-5},
journal = {NPG Asia Materials},
number = 9,
volume = 10,
place = {United States},
year = {2018},
month = {9}
}

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