Dielectric and ferroelectric study of KNN modified NBT ceramics synthesized by microwave processing technique

Sridevi Swain, Pawan Kumar, Dinesh Kumar Agrawal, Sonia

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Morphotropic phase boundary (MPB) composition, 0.93Na 0.5 Bi 0.5 TiO 3 -0.07K 0.5 Na 0.5 NbO 3 /NBT-KNN was synthesized by microwave heating. The optimized calcination conditions for single perovskite phase formation were 800 °C for 40 min, whereas the sintering was carried out at 1150 °C for 20, 30 and 40 min. The MPB composition, sintered for 30 min, showed better properties: nearly uniform and larger grain size of ∼2.52 μm, room temperature (RT) dielectric constant (ε r ) ∼1180 at 1 kHz, a relatively high bulk density (ρ) ∼5.49 g/cc, remnant polarization (2P r ) ∼3.3μC/cm 2 and coercive field (E c ) ∼5.8 kV/cm. Diffuse phase transition was observed for all the ceramics with highest diffusivity factor, γ∼1.65 in MPB composition sintered for 30 min.

Original languageEnglish (US)
Pages (from-to)3205-3210
Number of pages6
JournalCeramics International
Volume39
Issue number3
DOIs
StatePublished - Apr 1 2013

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Phase boundaries
Ferroelectric materials
Microwaves
Processing
Chemical analysis
Microwave heating
Perovskite
Calcination
Permittivity
Sintering
Phase transitions
Polarization
Temperature

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Swain, Sridevi ; Kumar, Pawan ; Agrawal, Dinesh Kumar ; Sonia. / Dielectric and ferroelectric study of KNN modified NBT ceramics synthesized by microwave processing technique. In: Ceramics International. 2013 ; Vol. 39, No. 3. pp. 3205-3210.
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Dielectric and ferroelectric study of KNN modified NBT ceramics synthesized by microwave processing technique. / Swain, Sridevi; Kumar, Pawan; Agrawal, Dinesh Kumar; Sonia.

In: Ceramics International, Vol. 39, No. 3, 01.04.2013, p. 3205-3210.

Research output: Contribution to journalArticle

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