Nanocomposite dielectrics in PbO-BaO-Na2O-Nb2O5-SiO2 system with high breakdown strength for high voltage capacitor applications.

Journal of nanoscience and nanotechnology · 2012 · Unclear · Insufficient evidence

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UnclearInsufficient evidencePaper 3163

Study snapshot

PublicationJournal of nanoscience and nanotechnology · 2012

Study typeengineering

Reported directionUnclear

Evidence ratingInsufficient

Abstract

Nanocomposite dielectrics in 6PbO-4BaO-20Na2O-40Nb2O5-30SiO2 system were prepared via melt-quenching followed by controlled crystallization. X-ray diffraction studies reveal that Pb2Nb2O7, Ba,NaNb5O15, NaNbO3 and PbNb2O6 phases are formed from the as-quenched glass annealed in temperature range from 700 degrees C to 850 degrees C. Ba2NaNb5O15, Pb2Nb2O7 crystallizes at 700 degrees C and then Pb2Nb2O7 disappears at 850 degrees C, while PbNb2O6 and NaNbO3 are formed at 850 degrees C. Microstructural observation shows that the crystallized particles are nanometer-sized and randomly distributed with glass matrix being often found at grain boundaries. The dielectric constant of the nanocomposites formed at different crystallization temperatures shows good frequency and electric field stability. The breakdown strength is slightly decreased when the glass-ceramics thickness is varied from 1 mm to 4 mm. The corresponding energy density could reach 2.96 J/cm3 with a breakdown strength of 58 kV/mm for thickness of 1 mm.

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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

Nanocomposite dielectrics in the 6PbO-4BaO-20Na2O-40Nb2O5-30SiO2 system were prepared by melt-quenching and controlled crystallization, forming different crystalline phases depending on annealing temperature (700–850 °C). The dielectric constant showed good frequency and electric field stability, and an energy density up to 2.96 J/cm3 was reported with a breakdown strength of 58 kV/mm for 1 mm thickness; breakdown strength slightly decreased as thickness increased from 1 mm to 4 mm.

Outcomes measured

Dielectric constant (frequency and electric field stability)
Breakdown strength (kV/mm)
Energy density (J/cm3)
Phase formation/crystallization behavior (XRD)
Microstructure (nanometer-sized crystallized particles)

View raw extracted JSON

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  },
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  "outcomes": [
    "Dielectric constant (frequency and electric field stability)",
    "Breakdown strength (kV/mm)",
    "Energy density (J/cm3)",
    "Phase formation/crystallization behavior (XRD)",
    "Microstructure (nanometer-sized crystallized particles)"
  ],
  "main_findings": "Nanocomposite dielectrics in the 6PbO-4BaO-20Na2O-40Nb2O5-30SiO2 system were prepared by melt-quenching and controlled crystallization, forming different crystalline phases depending on annealing temperature (700–850 °C). The dielectric constant showed good frequency and electric field stability, and an energy density up to 2.96 J/cm3 was reported with a breakdown strength of 58 kV/mm for 1 mm thickness; breakdown strength slightly decreased as thickness increased from 1 mm to 4 mm.",
  "effect_direction": "unclear",
  "limitations": [],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "nanocomposite dielectrics",
    "glass-ceramics",
    "controlled crystallization",
    "breakdown strength",
    "energy density",
    "high voltage capacitor",
    "PbO-BaO-Na2O-Nb2O5-SiO2",
    "X-ray diffraction",
    "microstructure"
  ],
  "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: 10.1166/jnn.2012.6825
PubMed: 23421296

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