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Related Concept Videos

Transformation of Plane Strain01:12

Transformation of Plane Strain

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When analyzing elongated structures like bars subjected to uniformly distributed loads, it is essential to understand the transformation of plane strain when coordinate axes are rotated. This transformation helps to assess how material deformation characteristics vary with orientation, which is crucial in materials science and structural engineering.
Under plane strain conditions, typical for members where one dimension significantly exceeds the others, deformations and resultant strains are...
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Solid–Solid Solutions01:24

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The temperature-composition phase diagram of two solids, A and B, which are immiscible in the solid phase but form miscible liquids, shows that when the temperature is low, these two exist as separate, pure solids (A and B). As the temperature increases, they transition into a single-phase liquid solution where A and B coexist. Moving from point a1 to a2 in the phase diagram, the composition changes such that solid B begins to separate from the solution, enriching the remaining liquid with A.
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Related Experiment Video

Updated: Mar 10, 2026

Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain
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Understanding Strain-Induced Phase Transformations in BiFeO3 Thin Films.

Hemant Dixit1, Christianne Beekman1, Christian M Schlepütz2

  • 1Materials Science and Technology Division Oak Ridge National Lab Oak Ridge TN 37831 USA.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|December 17, 2016
PubMed
Summary
This summary is machine-generated.

Strain engineering in bismuth ferrite (BiFeO3) thin films induces a striped phase with enhanced piezoelectric properties. This phase facilitates reversible transformations crucial for advanced electronic and photonic applications.

Keywords:
multiferroic BiFeO3phase coexistencepiezoelectric responsesolid‐state nudged elastic band method

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid State Chemistry

Background:

  • Bismuth ferrite (BiFeO3) thin films are known for their multiferroic properties.
  • Epitaxial strain can significantly alter the phase stability and properties of BiFeO3.
  • Understanding phase transformations is key to optimizing BiFeO3 performance.

Purpose of the Study:

  • To investigate the strain-induced coexisting striped phase in BiFeO3 thin films.
  • To characterize the intermediate S' polymorph and its role in phase transformation.
  • To elucidate the mechanism behind enhanced piezoelectricity in strained BiFeO3.

Main Methods:

  • Experimental characterization of BiFeO3 thin films under large epitaxial strain.
  • First-principles theoretical calculations.
  • Synergistic combination of theory and experiments.

Main Results:

  • A coexisting striped phase emerges, comprising tetragonal-like (T') and intermediate S' polymorphs.
  • The S' phase is energetically close to the T' phase and structurally similar to the rhombohedral (R) phase.
  • A flat energy landscape enables reversible phase transformation between T' and S' phases, enhancing piezoelectric response.
  • A blueshift in the band gap is observed from R to S' to T' phases.

Conclusions:

  • Strain engineering is critical for tuning electromechanical responses in BiFeO3.
  • The reversible T'-S' phase transformation is key to enhanced piezoelectricity.
  • BiFeO3 thin films with engineered phases offer potential for energy harvesting and photonic devices.