Ferroelectric and piezoelectric properties of (Bi1/2K1/2)TiO3 ceramics
Ferroelectric and piezoelectric properties of (Bi1/2K1/2)TiO3 ceramics
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DOI：
10.1143/jjap.44.5040
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发表时间：
2005-07-01
期刊：
影响因子：
--
通讯作者：
Takenaka, T
中科院分区：
文献类型：
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作者：
Hiruma, Y;Aoyagi, R;Takenaka, T
研究了钛酸铋钾（Bi1/2K1/2）TiO3 （BKT）陶瓷的介电、铁电和压电性能。采用热压法制备了相对密度高达97%的单相BKT陶瓷。在1060℃和1080℃下热压的BKT陶瓷（以下简称BKT- hp1060℃和BKT- hp1080℃）的电阻率相当高，约为10(13)ω。室温下（RT） cm。BKT-HP1060℃的居里温度T-c为437℃，相对于其他无铅压电材料的居里温度T-c较高。在本研究中，成功地获得了BKT陶瓷在完全饱和磁滞环下的铁电特性。BKT-HP1080℃的残余极化P-r和矫顽力场E-c分别为22.2 μ C/cm(2)和52.5kV/cm。BKT-HP1080℃的机电耦合系数k（33）和压电常数d（33）分别为0.28和69.8pC/N。根据压电和介电测量的温度依赖性，确定了340℃的第二相转变温度T-2。
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 degrees C (hereafter abbreviated as BKT-HP1060 degrees C and BKT-HP1080 degrees C) were fairly high being of the order of 10(13) Omega.cm at room temperature (RT). The Curie temperature T-c of BKT-HP1060 degrees C was 437 degrees 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 degrees C were 22.2 mu C/cm(2) and 52.5kV/cm, respectively. D-E hysteresis loops for these ceramics were observed even at 260 degrees C. The electromechanical coupling factor k(33) and piezoelectric constant d(33) of BKT-HP1080 degrees C were 0.28 and 69.8pC/N, respectively. The second-phase transition temperature T-2 of 340 degrees C was determined from the temperature dependence of piezoelectric and dielectric measurements.