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Effect of substitution of K for Na on the ferroelectric stability and properties in (Bi0.5Na1/2)TiO3-BaTiO3-(K1/2N1/2)NbO3

Jo, Wook and Rödel, Jürgen and Lee, Jong-Sook and Baik, Yoon-Hee and Park, Chan (2010):
Effect of substitution of K for Na on the ferroelectric stability and properties in (Bi0.5Na1/2)TiO3-BaTiO3-(K1/2N1/2)NbO3.
In: Functional Materials Letters, pp. 41-44, 03, (01), ISSN 1793-6047,
[Online-Edition: http://dx.doi.org/10.1142/S179360471000083X],
[Article]

Abstract

The effect of an isovalent chemical variation in A site cations on the stability of ferroelectric order and consequent changes in the electrical properties of ferroelectric 0.93(Bi1/2Na1/2)TiO3-0.05BaTiO3-0.02(K0.5Na0.5)NbO3 (0.93BNT-0.05BT-0.02KNN) lead-free piezoceramic at the morphotropic phase boundary (MPB) was investigated by substituting K for Na. X-ray diffraction analysis reveals that all the studied compositions undergo an irreversible phase transition from a pseudocubic to a mixture of rhombohedral and tetragonal phases during poling. In spite of the absence of an obvious structural difference, both electric-field-induced strain and polarization hysteresis loops show a clear distinction. It was found that the effect of substitution is so drastic that about 0.5 at% substitution renders the material softer and more than 1.0 at% results in a significant destabilization of the ferroelectric order. However, no notable difference in the temperature dependent permittivity measurements was detected, which suggests that the depoling of these materials has some other origin than a symmetry-breaking phase transition.

Item Type: Article
Erschienen: 2010
Creators: Jo, Wook and Rödel, Jürgen and Lee, Jong-Sook and Baik, Yoon-Hee and Park, Chan
Title: Effect of substitution of K for Na on the ferroelectric stability and properties in (Bi0.5Na1/2)TiO3-BaTiO3-(K1/2N1/2)NbO3
Language: English
Abstract:

The effect of an isovalent chemical variation in A site cations on the stability of ferroelectric order and consequent changes in the electrical properties of ferroelectric 0.93(Bi1/2Na1/2)TiO3-0.05BaTiO3-0.02(K0.5Na0.5)NbO3 (0.93BNT-0.05BT-0.02KNN) lead-free piezoceramic at the morphotropic phase boundary (MPB) was investigated by substituting K for Na. X-ray diffraction analysis reveals that all the studied compositions undergo an irreversible phase transition from a pseudocubic to a mixture of rhombohedral and tetragonal phases during poling. In spite of the absence of an obvious structural difference, both electric-field-induced strain and polarization hysteresis loops show a clear distinction. It was found that the effect of substitution is so drastic that about 0.5 at% substitution renders the material softer and more than 1.0 at% results in a significant destabilization of the ferroelectric order. However, no notable difference in the temperature dependent permittivity measurements was detected, which suggests that the depoling of these materials has some other origin than a symmetry-breaking phase transition.

Journal or Publication Title: Functional Materials Letters
Volume: 03
Number: 01
Uncontrolled Keywords: Lead-free piezoceramics; bismuth sodium titanate; electric-field-induced phase transition
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > A - Synthesis > Subproject A1: Manufacturing of ceramic, textured actuators with high strain
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > A - Synthesis
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue
Zentrale Einrichtungen
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres
DFG-Collaborative Research Centres (incl. Transregio)
Date Deposited: 20 Jun 2011 08:40
Official URL: http://dx.doi.org/10.1142/S179360471000083X
Additional Information:

SFB 595 A1

Identification Number: doi:10.1142/S179360471000083X
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