PREPARATION AND PROPERTIES OF PZN-PZT PIEZOELECTRIC CERAMICS AND PZN-PZT/PVDF PIEZOELECTRIC COMPOSITES

Ternary system piezoelectric ceramic materials PZN-PZT and their powders were fabricated using solid state sintered technology. Their structure and properties were studied by XRD and SEM. PZN-PZT ceramics synthesized by the traditional sintered method contain well piezoelectric properties. The diameters of PZN-PZT powders are between 0.5~4μm, and the shape is irregular. PZN-PZT particles were incorporated into PVDF polymer matrix homogeneously through solution blended process to form PZN-PZT/PVDF 0-3 composite thin films. The effects of the ceramic mass fraction and poling electric field on the piezoelectric and dielectric properties of the piezoelectric composites were studied. The results show that the piezoelectric properties of the composites could be improved effectively through choosing the ceramics containing better piezoelectric properties as the filler. The same effects can be made with the increasing of PZN-PZT mass fraction and poling field.