PNW-PMS-PZT压电陶瓷准同型相界的压电性能研究

采用传统陶瓷工艺制备了PNW—PMS—PZT四元系压电陶瓷,分析了陶瓷样品的相结构组成,结果表明,所有陶瓷样品的相结构为纯钙钛矿相结构;研究了室温下PMS含量,PNW 含量和Zr/Ti的变化对准同型相界的影响规律,实验表明随着PMS、PNW含量和Zr/Ti的增加,材料体系逐渐由四方相向三方相过渡,获得了处于准同型相界附近的材料组成:PMS 的含量在5—6mol%、PNW的含量在2—3mol%、PZT的含量在91—93mol%、Zr/Ti的变化靠近50/50,同时具有高的机电性能.

Piezoelectric Properties of Morphotropic Phase Boundary for PNW-PMS-PZT Piezoelectric Ceramics

The piezoelectric ceramics (PNW-PMS-PZT) were prepared by traditional ceramics process. The phase structure of all ceramics samples was analyzed. Results show that the pure perovskite phase is in all ceramics specimens researched. The effect of the content of PMS, PNW and Zr/Ti ratio on the region of morphotropic phase boundary for PNW-PMS-PZT piezoelectric ceramics was studied. Results show that the phase structure of PNW-PMS-PZT piezoelectric ceramics changes from tetragonal to rhombohedral with the increase of the amount of PMS, PNW and the ratio of Zr/Ti in the system. The composition of PNW-PMS-PZT piezoelectric ceramics near the morphotropic phase boundary obtained is the content of PMS: 5-6mol%; the content of PNW: 2-3mol%; the content of PZT: 91~93mol%; the ratio of Zr/Ti: 50/50. At the same time, there is high piezoelectricity near the morphotropic phase boundary.