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Preparation and enhanced electrical properties of grain-oriented (Bi1/2Na1/2)TiO3-based lead-free incipient piezoceramics

Zhang, Haibo and Xu, Peiwei and Patterson, Eric A. and Zang, Jiadong and Jiang, Shenling and Rödel, Jürgen (2015):
Preparation and enhanced electrical properties of grain-oriented (Bi1/2Na1/2)TiO3-based lead-free incipient piezoceramics.
In: Journal of the European Ceramic Society, pp. 2501-2512, 35, (9), ISSN 09552219,
[Online-Edition: http://dx.doi.org/10.1016/j.jeurceramsoc.2015.03.012],
[Article]

Abstract

(Bi1/2Na1/2)TiO3 (BNT) based lead-free incipient piezoceramics are promising candidates for actuator applications due to their giant electromechanical strains originating from the reversible relaxor-ferroelectric phase transition. To decrease the electric field required for this large strain, the templated grain growth method was employed to prepare 〈1 0 0〉 oriented 0.91Bi1/2Na1/2TiO3–0.06BaTiO3–0.03AgNbO3 piezoceramics using plate-like BNT templates. Textured samples provided a high unipolar strain of 0.38% and a corresponding large signal piezoelectric coefficient, View the MathML sourced33∗ of 766 pm/V at 5 kV/mm, which are 78% higher than the values of the randomly oriented ones. The enhanced electric-field-induced strain at relatively lower field was attributed primarily to the facilitated phase-transition to form a long range ferroelectric order along the 〈1 0 0〉 direction. It was also found that the textured piezoceramics exhibited significantly reduced frequency dependence in the unipolar strain behavior at room temperature, resulting from the decreased electric field required for the relaxor-ferroelectric phase transition.

Item Type: Article
Erschienen: 2015
Creators: Zhang, Haibo and Xu, Peiwei and Patterson, Eric A. and Zang, Jiadong and Jiang, Shenling and Rödel, Jürgen
Title: Preparation and enhanced electrical properties of grain-oriented (Bi1/2Na1/2)TiO3-based lead-free incipient piezoceramics
Language: English
Abstract:

(Bi1/2Na1/2)TiO3 (BNT) based lead-free incipient piezoceramics are promising candidates for actuator applications due to their giant electromechanical strains originating from the reversible relaxor-ferroelectric phase transition. To decrease the electric field required for this large strain, the templated grain growth method was employed to prepare 〈1 0 0〉 oriented 0.91Bi1/2Na1/2TiO3–0.06BaTiO3–0.03AgNbO3 piezoceramics using plate-like BNT templates. Textured samples provided a high unipolar strain of 0.38% and a corresponding large signal piezoelectric coefficient, View the MathML sourced33∗ of 766 pm/V at 5 kV/mm, which are 78% higher than the values of the randomly oriented ones. The enhanced electric-field-induced strain at relatively lower field was attributed primarily to the facilitated phase-transition to form a long range ferroelectric order along the 〈1 0 0〉 direction. It was also found that the textured piezoceramics exhibited significantly reduced frequency dependence in the unipolar strain behavior at room temperature, resulting from the decreased electric field required for the relaxor-ferroelectric phase transition.

Journal or Publication Title: Journal of the European Ceramic Society
Volume: 35
Number: 9
Uncontrolled Keywords: Lead-free piezoceramics; Templated grain growth; Electromechanical properties; Electric-field-induced strain; Phase transition
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: 20 Apr 2015 07:53
Official URL: http://dx.doi.org/10.1016/j.jeurceramsoc.2015.03.012
Identification Number: doi:10.1016/j.jeurceramsoc.2015.03.012
Funders: H.Z. thanks the Alexander-von-Humboldt foundation for generous funding. The authors acknowledge also the generous support by the National Natural Science Foundation of China under grant no. 51202074 and supported by the, Fundamental Research Funds for the Central Universities under grant no. 2014XJGH005.
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