Ferroelectric and piezoelectric properties of (Bi1/2K1/2)TiO3 ceramics fabricated by hot-pressing method
Ferroelectric and piezoelectric properties of (Bi1/2K1/2)TiO3 ceramics fabricated by hot-pressing method
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热压法制备(Bi1/2K1/2)TiO3陶瓷的铁电和压电性能
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
T. Takenaka
中科院分区：
文献类型：
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作者：
Y. Hiruma;Kota Marumo;R. Aoyagi;H. Nagata;T. Takenaka
采用热压法制备了(Bi1/2K1/2)TiO3(BKT)陶瓷。在1,060和1,080℃热压的BKT陶瓷(以下简称BKT-HP1060°C和BKT-HP1080°C)和x质量分数的Bi2O、La_2O_3和MnCO_3掺杂的BKT陶瓷(以下简称BKTBix；x = 0.1-0.6，BKTLax；x = 0.1-0.6和BKTMnx；x = 0.1-0.3)的相对密度均高于97%。在本研究中，成功地获得了BKT陶瓷的铁电性能，BKT-HP1080°C的剩余极化Pr和矫顽场Ec分别为22.2kV/cm~2和52.5kV/cm。少量La有增加Pr的趋势，BKTLa0.1的Pr为19.2μC/cm~2。通过提高材料的压电性来优化极化条件，得到BKT-HP1080°C的机电耦合系数k33为0.34，压电常数d33为82.8pC/N。
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°C and BKT-HP1080°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 Pr and coercive field Ec of BKT-HP1080°C were 22.2 μC/cm2 and 52.5 kV/cm, respectively. A small amount of La tends to increase Pr, and the Pr of BKTLa0.1 was 19.2 μC/cm2. The piezoelectricities were improved to optimize poling conditions, and the electromechanical coupling factor k33 and piezoelectric constant d33 of BKT-HP1080°C were 0.34 and 82.8 pC/N, respectively.