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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.118  No.1380 (August) (2010)  >  pp.726-730

Journal of the Ceramic Society of Japan
<<Previous article Vol.118  No.1380 (August) (2010)   pp.726 - 730 Next article>>

Electric-field-induced strain for (Bi1/2Na1/2)TiO3-based lead-free multilayer actuator

Hajime NAGATA1), Yuji HIRUMA1) and Tadashi TAKENAKA1)
1) Department of Electrical Engineering, Faculty of Science and Technology, Tokyo University of Science

  Multilayer prototype actuators were demonstrated using (Bi1/2Na1/2)TiO3 [BNT]-based ceramics as active layers and Pt as internal electrodes. One of the BNT-based solid solutions, 0.68(Bi1/2Na1/2)TiO3–0.04(Bi1/2Li1/2)TiO3–0.28(Bi1/2K1/2)TiO3 (BNLKT4–28) has been selected as the an active layer and it showed a relatively large piezoelectric strain constant d33 of 130 pC/N and a high depolarization temperature Td of 226°C. The total number of layers was 10 and the active layer thickness was 125 µm for the sintered body. The final compact dimensions were approximately 5 × 5 × 2 mm3. From the SEM observation, there were no apparent delaminations around the interface between Pt electrodes and active BNLKT layers. The large electric-field-induced strain at 70 kV/cm was 0.17% and the longitudinal dynamic displacement at the same electric field was 2.1 µm.


Keyword:
Lead-free, Multilayer ceramic actuator, Electric-field-induced strain, Bismuth sodium titanate

Received: May 06, 2010
Accepted: July 15, 2010 , Published online: August 01, 2010
Copyright (c) 2010 The Ceramic Society of Japan

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