Theoretical Studies Of The Properties Of Ferroelectric Ceramic-polymer Composite Materials

The existing theories which are used to interpretrnexperimental data on the dielectric, elastic and piezoelectricrnproperties of composite materials are summarized. An effectivernmedium theory which treats both components symmetrically has beenrninvestigated to show that the geometric factors are importantrnparameters which could take care of both the effects of shape ofrninclusions and the concept of connectivity, and to demonstraternthat the shape of inclusions greatly affect the dielectric,rnelastic and piezoelectric properties of composite materials.rnThe properties of composite materials are studied as arnfunction of the PZT volume fraction and the geometric factors andrnshowed that the geometric factor of the component with low volumernfraction are more effective and the piezoelectric property ofrncomposite materials depend more on the geometric factors for therndielectric constant than on those of the elastic constant.rnThe theoretical predictions are generalized to study therntemperature dependence of the properties of the compositernmaterials.rnNew expressions for the piezoelectric constants of compositernmaterials are derived and used to study their volume fraction,rnshape of inclusions and temperature dependence.rnFinally, the theoretical predictions are tested withrnexperimental data on a variety of composite materials.

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