Three kinds of piezoelectric ceramics,PZT-N (a soft PZT),PZT-F (a hard PZT),and PZT-C (a stress-stable PZT) have been applied as the skeleton materials.

• 选用了三种类型的压电陶瓷:“硬性”压电陶瓷(PZT-F)、“软性”压电陶瓷(PZT-N)和“稳定型”压电陶瓷(PZT-C)。