Effect of external normal and parallel electric fields on 180° ferroelectric domain walls in PbTiO₃.

Journal of physics. Condensed matter : an Institute of Physics journal · 2011 · Unclear · Insufficient evidence

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UnclearInsufficient evidencePaper 3286

Study snapshot

PublicationJournal of physics. Condensed matter : an Institute of Physics journal · 2011

Study typeengineering

Reported directionUnclear

Evidence ratingInsufficient

Abstract

We impose uniform electric fields both parallel and normal to 180° ferroelectric domain walls in PbTiO₃ and obtain the equilibrium structures using the method of anharmonic lattice statics. In addition to Ti-centered and Pb-centered perfect domain walls, we also consider Ti-centered domain walls with oxygen vacancies. We observe that an electric field can increase the thickness of the domain wall considerably. We also observe that increasing the magnitude of the electric field we reach a critical electric field E(c); for E > E(c) there is no local equilibrium configuration. Therefore, E(c) can be considered as an estimate of the threshold field E(h) for domain wall motion. Our numerical results show that oxygen vacancies decrease the value of E(c). As the defective domain walls are thicker than perfect walls, this result is in agreement with the recent experimental observations and continuum calculations that show thicker domain walls have lower threshold fields.

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AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeengineering

Effect directionunclear

PopulationNot supplied

Sample sizeNot supplied

ExposureNot supplied

Evidence strengthInsufficientConfidence: 74% · Peer reviewed: yes

Main findings

Using anharmonic lattice statics, the authors report that applying uniform electric fields parallel or normal to 180° ferroelectric domain walls in PbTiO3 can considerably increase domain wall thickness. They identify a critical electric field Ec above which no local equilibrium configuration exists, and interpret Ec as an estimate of the threshold field for domain wall motion; oxygen vacancies reduce Ec.

Outcomes measured

Ferroelectric domain wall thickness
Critical electric field for local equilibrium (Ec) / threshold field estimate for domain wall motion (Eh)
Effect of oxygen vacancies on Ec

Limitations

Computational/numerical study (anharmonic lattice statics) rather than biological/epidemiological evidence
No quantitative field strengths or parameter values reported in the abstract
Material-specific (PbTiO3; specific domain wall types and oxygen vacancy defects)

View raw extracted JSON

{
  "study_type": "engineering",
  "exposure": {
    "band": null,
    "source": "external electric field",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Ferroelectric domain wall thickness",
    "Critical electric field for local equilibrium (Ec) / threshold field estimate for domain wall motion (Eh)",
    "Effect of oxygen vacancies on Ec"
  ],
  "main_findings": "Using anharmonic lattice statics, the authors report that applying uniform electric fields parallel or normal to 180° ferroelectric domain walls in PbTiO3 can considerably increase domain wall thickness. They identify a critical electric field Ec above which no local equilibrium configuration exists, and interpret Ec as an estimate of the threshold field for domain wall motion; oxygen vacancies reduce Ec.",
  "effect_direction": "unclear",
  "limitations": [
    "Computational/numerical study (anharmonic lattice statics) rather than biological/epidemiological evidence",
    "No quantitative field strengths or parameter values reported in the abstract",
    "Material-specific (PbTiO3; specific domain wall types and oxygen vacancy defects)"
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "electric field",
    "ferroelectric domain wall",
    "PbTiO3",
    "180 degree domain wall",
    "anharmonic lattice statics",
    "oxygen vacancies",
    "critical electric field",
    "threshold field",
    "domain wall thickness"
  ],
  "suggested_hubs": []
}

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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1088/0953-8984/23/3/035901
PubMed: 21406870

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