Jpn. J. Appl. Phys. 44 (2005) pp. 5040-5044 |Previous Article| |Next Article| |Table of Contents|
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Ferroelectric and Piezoelectric Properties of (Bi1/2K1/2)TiO3 Ceramics
Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
(Received February 4, 2005; accepted March 23, 2005; published July 8, 2005)
The dielectric, ferroelectric and piezoelectric properties of bismuth potassium titanate, (Bi1/2K1/2)TiO3 (BKT), ceramics were studied. Single-phase BKT ceramics with a high relative density of 97% were obtained by the hot pressing (HP) method. The resistivities of BKT ceramics hot-pressed at 1060 and 1080°C (hereafter abbreviated as BKT-HP1060°C and BKT-HP1080°C) were fairly high being of the order of 1013 Ω·cm at room temperature (RT). The Curie temperature Tc of BKT-HP1060°C was 437°C, which is relatively higher than those of other lead-free piezoelectric materials. In this study, the ferroelectric properties of BKT ceramics were successfully obtained with fully saturated hysteresis loops. The remanent polarization Pr and coercive field Ec of BKT-HP1080°C were 22.2 µC/cm2 and 52.5 kV/cm, respectively. D–E hysteresis loops for these ceramics were observed even at 260°C. The electromechanical coupling factor k33 and piezoelectric constant d33 of BKT-HP1080°C were 0.28 and 69.8 pC/N, respectively. The second-phase transition temperature T2 of 340°C was determined from the temperature dependence of piezoelectric and dielectric measurements.
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