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

Sridevi Swain; Pawan Kumar; Dinesh K. Agrawal; Sonia

doi:10.1016/j.ceramint.2012.10.005

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

Sridevi Swain, Pawan Kumar, Dinesh K. Agrawal, Sonia

Materials Research Institute (MRI)

Research output: Contribution to journal › Article › peer-review

51 Scopus citations

Abstract

Morphotropic phase boundary (MPB) composition, 0.93Na_0.5Bi _0.5TiO₃-0.07K_0.5Na_0.5NbO 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/cm² 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 language	English (US)
Pages (from-to)	3205-3210
Number of pages	6
Journal	Ceramics International
Volume	39
Issue number	3
DOIs	https://doi.org/10.1016/j.ceramint.2012.10.005
State	Published - Apr 2013

All Science Journal Classification (ASJC) codes

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

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10.1016/j.ceramint.2012.10.005

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title = "Dielectric and ferroelectric study of KNN modified NBT ceramics synthesized by microwave processing technique",

abstract = "Morphotropic phase boundary (MPB) composition, 0.93Na0.5Bi 0.5TiO3-0.07K0.5Na0.5NbO 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 (εr) ∼1180 at 1 kHz, a relatively high bulk density (ρ) ∼5.49 g/cc, remnant polarization (2Pr) ∼3.3μC/cm2 and coercive field (Ec) ∼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.",

author = "Sridevi Swain and Pawan Kumar and Agrawal, {Dinesh K.} and Sonia",

note = "Funding Information: One of the authors (Ms. Sridevi Swain) is grateful for the financial support provided by Department of Science and Technology (under INSPIRE scheme), New Delhi, India . ",

year = "2013",

month = apr,

doi = "10.1016/j.ceramint.2012.10.005",

language = "English (US)",

volume = "39",

pages = "3205--3210",

journal = "Ceramics International",

issn = "0272-8842",

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T1 - Dielectric and ferroelectric study of KNN modified NBT ceramics synthesized by microwave processing technique

AU - Swain, Sridevi

AU - Kumar, Pawan

AU - Agrawal, Dinesh K.

AU - Sonia,

N1 - Funding Information: One of the authors (Ms. Sridevi Swain) is grateful for the financial support provided by Department of Science and Technology (under INSPIRE scheme), New Delhi, India .

PY - 2013/4

Y1 - 2013/4

N2 - Morphotropic phase boundary (MPB) composition, 0.93Na0.5Bi 0.5TiO3-0.07K0.5Na0.5NbO 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 (εr) ∼1180 at 1 kHz, a relatively high bulk density (ρ) ∼5.49 g/cc, remnant polarization (2Pr) ∼3.3μC/cm2 and coercive field (Ec) ∼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.

AB - Morphotropic phase boundary (MPB) composition, 0.93Na0.5Bi 0.5TiO3-0.07K0.5Na0.5NbO 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 (εr) ∼1180 at 1 kHz, a relatively high bulk density (ρ) ∼5.49 g/cc, remnant polarization (2Pr) ∼3.3μC/cm2 and coercive field (Ec) ∼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.

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DO - 10.1016/j.ceramint.2012.10.005

M3 - Article

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SN - 0272-8842

VL - 39

SP - 3205

EP - 3210

JO - Ceramics International

JF - Ceramics International

IS - 3

ER -

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

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