Giant strain in lead-free piezoceramics Bi0.5Na0.5TiO3–BaTiO3–K0.5Na0.5NbO3 system

Applied Physics Letters - Tập 91 Số 11 - 2007
Shan‐Tao Zhang1, Alain Brice Kounga1, Emil Aulbach1, Helmut Ehrenberg2, Jürgen Rödel1
1Technical University Darmstadt Institute of Materials Science, , Petersenstr. 23, 64287 Darmstadt, Germany
2Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden (IWF) , Helmholtzstr. 20, 01069 Dresden, Germany

Tóm tắt

Piezoelectric actuators convert electrical into mechanical energy and are implemented for many large-scale applications such as piezoinjectors and ink jet printers. The performance of these devices is governed by the electric-field-induced strain. Here, the authors describe the development of a class of lead-free (0.94−x)Bi0.5Na0.5TiO3–0.06BaTiO3–xK0.5Na0.5NbO3 ceramics. These can deliver a giant strain (0.45%) under both unipolar and bipolar field loadings, which is even higher than the strain obtained with established ferroelectric Pb(Zr,Ti)O3 ceramics and is comparable to strains obtained in Pb-based antiferroelectrics.

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