PIEZOELECTRIC POLYMER COMPOSITE-MATERIALS

Diphasic composites of piezoelectric and polymer materials have outsta nding properties from device application point of view. These material s offer a possibility of design and fabrication of the materials with definite properties for specific application. Hence these are called s mart materials. In this paper we present an outline of this field of r esearch. The mixture rules of dielectric properties of these composite s with 0-3 or 3-0.connectivity are presented. The modified equation ta kes into account the local field interactions. Impedance and electrome chanical coupling coefficients of these composites with 2-2 connectivi ty for circular and rectangular geometry can be estimated. The piezoel ectric constants of these materials exhibit Debye-type relaxations. Co le-Cole plots can be drawn. A stress field applied to this material ca n produce an overall piezoelectricity. Piezoelectric constant of these materials can be related to the elastic and dielectric properties of the component phases.