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Designing Morphotropic Phase Composition in BiFeO3.

Andreas Herklotz1,2, Stefania F Rus3, Nina Balke4

  • 1Materials Science and Technology Division , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States.

Nano Letters
|January 24, 2019
PubMed
Summary
This summary is machine-generated.

Low-energy helium implantation allows continuous, iterative tailoring of multiferroic bismuth ferrite (BiFeO3) films

Keywords:
Morphotropic phasesferroelectricsimplantationmetastabilitystrain

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Ferroelectricity

Background:

  • Classical morphotropic piezoelectric materials exhibit improved properties by forming mixed-phase regimes.
  • Multiferroic bismuth ferrite (BiFeO3) films possess morphotropic-like phases, but their composition is difficult to modify post-synthesis.

Purpose of the Study:

  • To demonstrate a novel postsynthesis method for continuously tuning morphotropic phases in epitaxial BiFeO3 films.
  • To explore a new phase space accessible through strain doping via helium implantation.

Main Methods:

  • Utilizing low-energy helium implantation to induce lattice stress in epitaxial BiFeO3 films.
  • Applying a strain doping approach to modify phase composition iteratively.

Main Results:

  • Successfully demonstrated postsynthesis, continuous, and iterative tailoring of morphotropic phases in BiFeO3 films.
  • Created a new phase space in BiFeO3 films governed by internal and external lattice stress.

Conclusions:

  • Helium implantation offers a versatile postsynthesis method for controlling phase composition in multiferroic materials.
  • The strain doping approach provides an analogue to temperature-composition phase diagrams in classical morphotropic ferroelectric systems.