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 (Bi_1/2K_1/2)TiO₃ Ceramics

Yuji Hiruma, Rintaro Aoyagi, Hajime Nagata and Tadashi Takenaka

(Received February 4, 2005; accepted March 23, 2005; published July 8, 2005)

The dielectric, ferroelectric and piezoelectric properties of bismuth potassium titanate, (Bi_1/2K_1/2)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 T_c 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 P_r and coercive field E_c 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.

URL: http://jjap.jsap.jp/link?JJAP/44/5040/
DOI: 10.1143/JJAP.44.5040

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