Title :
Lead-free piezoceramics with a giant strain for actuator applications
Author :
Jo, W. ; Zhang, S.T. ; Kounga, A.B. ; Rödel, J.
Author_Institution :
Department of Materials Science, Technische Universitat Darmstadt, Petersenstrasse 23, 64287, Germany
Abstract :
The piezoelectric properties of lead-free piezoelectric ceramics of (1-x-y)Bi0.5Na0.5TiO3 (BNT) - xBaTiO3 (BT) -yK0.5Na0.5NbO3 (KNN) (0.05 ?? x ?? 0.07 and 0.01 ?? y ?? 0.03) have been studied. Measured bipolar strain behavior showed that all the compositions studied can be categorized into two groups: ferroelectric-order dominent and antiferroelectric-order dominent one. At the boundary of two groups, especially high piezoelectric response, i.e. large-signal d33 was observed, which indicates that the observed high strain is closely related to the field-induced antiferroelectric to ferroelectric phase transition.
Keywords :
Actuators; Capacitive sensors; Ceramics; Environmentally friendly manufacturing techniques; Ferroelectric materials; Iron; Materials science and technology; Piezoelectric materials; Solid state circuits; Temperature dependence;
Conference_Titel :
Applications of Ferroelectrics, 2008. ISAF 2008. 17th IEEE International Symposium on the
Conference_Location :
Santa Re, NM, USA
Print_ISBN :
978-1-4244-2744-4
Electronic_ISBN :
1099-4734
DOI :
10.1109/ISAF.2008.4693817
