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A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
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Elastic distortion determining conduction in BiFeO3 phase boundaries.

Kristina M Holsgrove1, Martial Duchamp2,3, M Sergio Moreno4

  • 1School of Mathematics and Physics, Queen's University Belfast UK kholsgrove04@qub.ac.uk m.arredondo@qub.ac.uk.

RSC Advances
|May 6, 2022
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Summary
This summary is machine-generated.

Elastic distortion, not defects, enhances electrical conductivity at phase boundaries in bismuth ferrite (BiFeO3) thin films. Stress-writing increases conductivity by altering strain accommodation at R-T boundaries.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Phase boundaries between tetragonal-like (T) and rhombohedral-like (R) phases in bismuth ferrite (BiFeO3) thin films are known to exhibit enhanced electrical conductivity.
  • The underlying mechanism responsible for this conductivity at R-T phase boundaries in BiFeO3 remains poorly understood.

Purpose of the Study:

  • To investigate the origin of enhanced electrical conductivity at R-T phase boundaries in mixed-phase BiFeO3 thin films.
  • To differentiate between defect accumulation and elastic distortion as potential causes for boundary conduction.

Main Methods:

  • Fabrication and manipulation of mixed-phase BiFeO3 thin films using stress and electric fields.
  • Utilizing advanced electron microscopy techniques, including atomic resolution imaging and localized crystallography.
  • Comparative analysis of virgin and stress-written microstructures to identify differences in R-T boundaries.

Main Results:

  • Stress-written regions exhibit significantly higher phase boundary electrical conductivity compared to as-grown microstructures.
  • Point defects and mixed valence states are present in both conducting and non-conducting regions, with homogeneous spatial distribution.
  • Extensive elastic distortion and strain accommodation at R-T boundaries in stress-written films lead to bond straightening, correlating with increased conductivity.

Conclusions:

  • Elastic distortion across R-T phase boundaries is the primary factor governing electrical conduction in mixed-phase BiFeO3.
  • The degree of strain accommodation, rather than point defect aggregation, dictates the conductivity enhancement at these boundaries.