Ferroelectric and piezoelectric properties of (Bi1/2K1/2)TiO3 ceramics fabricated by hot-pressing method

Bismuth potassium titanate, (Bi1/2K1/2)TiO3 (BKT), ceramics were prepared by the hot-pressing (HP) method without dopant and with dopants of Bi2O3, La2O3 and MnCO3. The relative density of BKT ceramics hot-pressed at 1,060 and 1,080 C (hereafter abbreviated to BKT-HP1060 degrees C and BKT-HP1080 degrees C) and x mass% Bi2O3, La2O3 and MnCO3 doped BKT ceramics hot-pressed at 1,060 C (hereafter abbreviated as BKTBix; x=0.1-0.6, BKTLax; x=0.1-0.6 and BKTMnx; x=0.1-0.3) were all higher than 97%. In this study, the ferroelectric properties of BKT ceramics were successfully obtained, and the remanent polarization P-r and coercive field E-c of BKT-HP 1080 degrees C were 22.2 mu C/cm(2) and 52.5 kV/cm, respectively. A small amount of La tends to increase P-r, and the P-r of BKTLa0.1 was 19.2 mu C/cm(2). The piezoelectricities were improved to optimize poling conditions, and the electromechanical coupling factor k(33) and piezoelectric constant d(33) Of BKT-HP1080 degrees C were 0.34 and 82.8 pC/N, respectively.