Investigation of Electric Field-Induced Structural Changes at Fe-Doped SrTiO₃ Anode Interfaces by Second Harmonic Generation.

Materials (Basel, Switzerland) · 2016 · Mixed · Insufficient evidence

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MixedInsufficient evidencePaper 2859

Study snapshot

PublicationMaterials (Basel, Switzerland) · 2016

Study typeother

Reported directionMixed

Evidence ratingInsufficient

Abstract

We report on the detection of electric field-induced second harmonic generation (EFISHG) from the anode interfaces of reduced and oxidized Fe-doped SrTiO₃ (Fe:STO) single crystals. For the reduced crystal, we observe steady enhancements of the susceptibility components as the imposed -voltage increases. The enhancements are attributed to a field-stabilized electrostriction, leading to Fe:Ti-O bond stretching and bending in Fe:Ti-O₆ octahedra. For the oxidized crystal, no obvious structural changes are observed below 16 kV/cm. Above 16 kV/cm, a sharp enhancement of the susceptibilities occurs due to local electrostrictive deformations in response to oxygen vacancy migrations away from the anode. Differences between the reduced and oxidized crystals are explained by their relative oxygen vacancy and free carrier concentrations which alter internal electric fields present at the Pt/Fe:STO interfaces. Our results show that the optical SHG technique is a powerful tool for detecting structural changes near perovskite-based oxide interfaces due to field-driven oxygen vacancy migration.

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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 typeother

Effect directionmixed

PopulationNot supplied

Sample sizeNot supplied

ExposureNot supplied

Evidence strengthInsufficientConfidence: 74% · Peer reviewed: yes

Main findings

Electric field-induced SHG was detected from anode interfaces of reduced and oxidized Fe-doped SrTiO3 single crystals. In reduced crystals, susceptibility components increased steadily with increasing imposed negative voltage, attributed to field-stabilized electrostriction. In oxidized crystals, no obvious structural changes were observed below 16 kV/cm, while above 16 kV/cm susceptibilities increased sharply, attributed to local electrostrictive deformations associated with oxygen vacancy migration away from the anode.

Outcomes measured

Electric field-induced second harmonic generation (EFISHG) at Pt/Fe:SrTiO3 anode interfaces
Changes in SHG susceptibility components with applied voltage/field
Structural changes attributed to electrostriction (bond stretching/bending in Fe:Ti-O6 octahedra)
Threshold behavior in oxidized crystal (no obvious changes below 16 kV/cm; sharp enhancement above 16 kV/cm)
Oxygen vacancy migration effects near oxide interfaces

Limitations

Sample size not reported in abstract
No exposure duration or time course details provided beyond qualitative descriptions
Study is on material interfaces (single crystals), not biological/health outcomes

View raw extracted JSON

{
  "study_type": "other",
  "exposure": {
    "band": null,
    "source": "applied electric field (anode interface in Fe-doped SrTiO3 single crystals)",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Electric field-induced second harmonic generation (EFISHG) at Pt/Fe:SrTiO3 anode interfaces",
    "Changes in SHG susceptibility components with applied voltage/field",
    "Structural changes attributed to electrostriction (bond stretching/bending in Fe:Ti-O6 octahedra)",
    "Threshold behavior in oxidized crystal (no obvious changes below 16 kV/cm; sharp enhancement above 16 kV/cm)",
    "Oxygen vacancy migration effects near oxide interfaces"
  ],
  "main_findings": "Electric field-induced SHG was detected from anode interfaces of reduced and oxidized Fe-doped SrTiO3 single crystals. In reduced crystals, susceptibility components increased steadily with increasing imposed negative voltage, attributed to field-stabilized electrostriction. In oxidized crystals, no obvious structural changes were observed below 16 kV/cm, while above 16 kV/cm susceptibilities increased sharply, attributed to local electrostrictive deformations associated with oxygen vacancy migration away from the anode.",
  "effect_direction": "mixed",
  "limitations": [
    "Sample size not reported in abstract",
    "No exposure duration or time course details provided beyond qualitative descriptions",
    "Study is on material interfaces (single crystals), not biological/health outcomes"
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "electric field-induced second harmonic generation",
    "EFISHG",
    "Fe-doped SrTiO3",
    "perovskite oxide interfaces",
    "electrostriction",
    "oxygen vacancy migration",
    "anode interface",
    "Pt/Fe:STO"
  ],
  "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: 10.3390/ma9110883
PubMed: 28774003

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