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

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  • NAGATA Hajime
    Department of Electrical Engineering, Faculty of Science and Technology, Tokyo University of Science
  • HIRUMA Yuji
    Department of Electrical Engineering, Faculty of Science and Technology, Tokyo University of Science
  • TAKENAKA Tadashi
    Department of Electrical Engineering, Faculty of Science and Technology, Tokyo University of Science

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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.

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