Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10629464 | Journal of the European Ceramic Society | 2015 | 12 Pages |
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 ã1Â 0Â 0ã 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, d33â of 766Â pm/V at 5Â 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 ã1Â 0Â 0ã 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.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Haibo Zhang, Peiwei Xu, Eric Patterson, Jiadong Zang, Shenling Jiang, Jürgen Rödel,