PIEZOELECTRIC PROPERTIES AT POLARIZATION REVERSAL PROCESS AND COERCIVE FORCE OF 0-3 COMPOSITE OF POLYMER AND CERAMIC POWDER MIXTURE OF PZT AND PBTIO3

Piezoelectric d constants (d33, d(h) and d31) of 0-3 composites of polymer and ceramic powder mixture of PZT and PbTiO3 at the polarization reversal process were measured at room temperature as a function of electric field after applying a reverse poling electric field to the prepoled composite specimens. Coercive force was obtained as a reverse poling field to make the piezoelectric d constants (d33, d(h) and d31) of the specimens zero. Coercive forces for d33, d31 and d(h) were different for the composites of polymer and ceramic powder mixture of PZT/PbTiO3 although they were identical for those of polymer and single ceramic powder (PZT or PbTiO3). These results are discussed theoretically based on a proposed model.