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Lead-free Bi1/2(Na0.82K0.18)1/2TiO3 relaxor ferroelectrics with temperature insensitive electrostrictive coefficient

Tran, Vu Diem Ngoc and Dinh, Thi Hinh and Han, Hyoung-Su and Jo, Wook and Lee, Jae-Shin (2013):
Lead-free Bi1/2(Na0.82K0.18)1/2TiO3 relaxor ferroelectrics with temperature insensitive electrostrictive coefficient.
In: Ceramics International, pp. S119-S124, 39, (Supplement 1), ISSN 02728842, [Online-Edition: http://dx.doi.org/10.1016/j.ceramint.2012.10.046],
[Article]

Abstract

The electric field-induced strain of Bi1/2(Na0.82K0.18)1/2TiO3 (BNKT) ceramics modified with BaZrO3 (BZ) was investigated as a function of composition and temperature. Unmodified BNKT ceramics revealed a typical ferroelectric butterfly-shaped bipolar S–E loop at room temperature, whose normalized strain (Smax/Emax) showed a significant temperature coefficient of 0.38 pm/V/K. As the BZ content increased in the solid solution up to 5 mol%, the ferroelectric BNKT gradually transformed to a relaxor. Finally, 5 mol% BZ-modified BNKT ceramics showed a typical electrostrictive behavior with a thermally stable electrostrictive coefficient (Q33) of 0.025 m4/C2, which is comparable to that of Pb(Mg1/3Nb2/3)O3 (PMN) ceramics that have been primarily used as Pb-based electrostrictive materials.

Item Type: Article
Erschienen: 2013
Creators: Tran, Vu Diem Ngoc and Dinh, Thi Hinh and Han, Hyoung-Su and Jo, Wook and Lee, Jae-Shin
Title: Lead-free Bi1/2(Na0.82K0.18)1/2TiO3 relaxor ferroelectrics with temperature insensitive electrostrictive coefficient
Language: English
Abstract:

The electric field-induced strain of Bi1/2(Na0.82K0.18)1/2TiO3 (BNKT) ceramics modified with BaZrO3 (BZ) was investigated as a function of composition and temperature. Unmodified BNKT ceramics revealed a typical ferroelectric butterfly-shaped bipolar S–E loop at room temperature, whose normalized strain (Smax/Emax) showed a significant temperature coefficient of 0.38 pm/V/K. As the BZ content increased in the solid solution up to 5 mol%, the ferroelectric BNKT gradually transformed to a relaxor. Finally, 5 mol% BZ-modified BNKT ceramics showed a typical electrostrictive behavior with a thermally stable electrostrictive coefficient (Q33) of 0.025 m4/C2, which is comparable to that of Pb(Mg1/3Nb2/3)O3 (PMN) ceramics that have been primarily used as Pb-based electrostrictive materials.

Journal or Publication Title: Ceramics International
Volume: 39
Number: Supplement 1
Uncontrolled Keywords: Dielectric properties; Piezoelectric properties; Perovskites; Actuators
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 22 Apr 2013 08:50
Official URL: http://dx.doi.org/10.1016/j.ceramint.2012.10.046
Identification Number: doi:10.1016/j.ceramint.2012.10.046
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