Piezoelectric Properties and Depolarization Temperatures of (Bi_1/2Na_1/2)TiO₃-(Bi_1/2K_1/2)TiO₃-BaTiO₃ Lead-Free Piezoelectric Ceramics

Abstract:

The piezoelectric properties of a solid solution based on the three components of bismuth sodium titanate, (Bi1/2Na1/2)TiO3 (BNT), bismuth potassium titanate, (Bi1/2K1/2)TiO3 (BKT), and barium titanate, BaTiO3 (BT), that is, x(Bi1/2Na1/2)TiO3-y(Bi1/2K1/2)TiO3-zBaTiO3 [BNBKy:z(x); x+y+z=1] are investigated. Fine piezoelectric properties in lead-free piezoelectric ceramics were obtained near the MPB composition, and the highest electromechanical coupling factors, k33 and kp, and piezoelectric constant, d33, were 0.58 and 0.36 for BNBK2:1(0.89) and 181 pC/N for BNBK2:1(0.88), respectively. In this study, we also measured the depolarization temperature, Td, from the temperature dependence of dielectric and piezoelectric properties.

• Periodical: Key Engineering Materials (Volume 320)
• Pages: 23-26
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.320.23
• Online since: September 2006
• Authors: Yuji Hiruma, Kazushige Yoshii, Rintaro Aoyagi, Hajime Nagata, Tadashi Takenaka
• Keywords: Bismuth Potassium Titanate, Bismuth Sodium Titanate (BNT), Depolarization Temperature, Dielectric Property, Lead-Free Piezoelectric Ceramic, Morphotropic Phase Boundary, Piezoelectric Properties

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