Structural design and properties of fine scale 2-2-2 PZT/epoxy piezoelectric composites for high frequency application

A kind of fine scale 2-2-2 PZT/epoxy piezoelectric composites consisting of PZT phase of uniform and Gaussian distribution were designed and prepared by cutting and filling method. The effects of thickness parameter on piezoelectric, dielectric and electromechanical coupling properties of the piezoelectric materials were investigated. The results show that piezoelectric composites exhibit large piezoelectric voltage constant and thickness electromechanical coupling coefficient. The relative permittivity, piezoelectric strain constant and planner electromechanical coupling coefficient increase with increasing the thickness of supporting base, and the piezoelectric voltage constant and thickness electromechanical coupling coefficient show the opposite variation. The Gaussian PZT/epoxy composite has larger piezoelectric voltage constant and thickness electromechanical coupling coefficient than the uniform PZT/epoxy composite.