Ultrafast collective oxygen-vacancy flow in Ca-doped BiFeO3

Cited 0 time in webofscience Cited 0 time in scopus
  • Hit : 32
  • Download : 2
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 mu m 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 degrees 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.
Publisher
NATURE PUBLISHING GROUP
Issue Date
2018-09
Language
English
Article Type
Article
Citation

NPG ASIA MATERIALS, v.10, pp.943 - 955

ISSN
1884-4049
DOI
10.1038/s41427-018-0087-5
URI
http://hdl.handle.net/10203/246582
Appears in Collection
PH-Journal Papers(저널논문)
Files in This Item
106712.pdf(2.29 MB)Download

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0