Preparation and enhanced electrical properties of grain-oriented (Bi1/2Na1/2)TiO3-based lead-free incipient piezoceramics. Issue 9 (September 2015)

• Record Type: Journal Article
• Authors: Zhang, Haibo; Xu, Peiwei; Patterson, Eric; Zang, Jiadong; Jiang, Shenling; Rödel, Jürgen
• Is Part Of: Journal of the European Ceramic Society. Volume 35:Issue 9(2015:Sep.)
• Page Start: 2501
• Page End: 2512
• Publication Date: 2015-09
• Subjects: Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2015.03.012
• Languages: English
• ISSNs: 0955-2219

Abstract

<abstract abstract-type="author" id="abs0005"> <title id="sect0005">Abstract</title> <sec> <p id="spar0005">(Bi<sub>1/2</sub>Na<sub>1/2</sub>)TiO<sub>3</sub> (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 0.91Bi<sub>1/2</sub>Na<sub>1/2</sub>TiO<sub>3</sub>–0.06BaTiO<sub>3</sub>–0.03AgNbO<sub>3</sub> piezoceramics using plate-like BNT templates. Textured samples provided a high unipolar strain of 0.38% and a corresponding large signal piezoelectric coefficient, <inline-formula><alternatives><inline-graphic xlink:href="ark:/27927/pgjj9q2d3g" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="si5.gif" overflow="scroll" id="d13e476" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msubsup><mml:mi>d</mml:mi><mml:mrow><mml:mn>33</mml:mn></mml:mrow><mml:mo>∗</mml:mo></mml:msubsup></mml:mrow></mml:math></alternatives></inline-formula> 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.</p> </sec> </abstract>