Development of grain oriented multilayer ceramic actuator using bismuth based lead-free perovskites

铅基压电陶瓷PZT被广泛应用于超声波发生器、传感器、谐振器和执行器等压电器件中。近年来，人们对开发环境友好型即无铅铁电和压电陶瓷的需求一直很强烈。(BI1/2K1/2)TiO_3[BKT]是一种铋系钙钛矿材料，居里温度约为400℃，压电常数D_(33)约为100 pC/N，因此，BKT陶瓷作为无铅压电致动器的候选材料备受关注。在本研究中，我们展示了使用无铅BKT陶瓷的多层压电致动器，并与块体BKT陶瓷相比显示出良好的电学性能。

Lead-based piezoelectric ceramics of Pb(Zr,Ti)O3 (PZT) are widely used in piezoelectric devices such as ultrasonic generators, sensors, resonators, and actuators. Recently, there has been a strong demand to develop environmentally friendly, that is, lead-free ferroelectric and piezoelectric ceramics. (Bi1/2K1/2)TiO3 [BKT] is one of bismuth based perovskite materials and showing high Curie temperature at approximately 400 oC and relatively large piezoelectric strain constant d33 about 100 pC/N. Therefore, BKT ceramics have been paid attention as one of candidates for lead-free piezoelectric actuator materials. In this study, we demonstrated multilayer piezoelectric actuators by using lead-free BKT ceramics and showing good electrical properties as compared with bulk BKT ceramics.