Giant strain in lead-free piezoceramics Bi0.5Na0.5TiO3-BaTiO3-K0.5Na0.5NbO3 system
Abstract
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.
- Publication:
-
Applied Physics Letters
- Pub Date:
- September 2007
- DOI:
- Bibcode:
- 2007ApPhL..91k2906Z
- Keywords:
-
- 77.65.Bn;
- 77.84.Dy;
- 77.80.Fm;
- 77.80.Bh;
- 77.80.Dj;
- Piezoelectric and electrostrictive constants;
- Niobates titanates tantalates PZT ceramics etc.;
- Switching phenomena;
- Phase transitions and Curie point;
- Domain structure;
- hysteresis