A flexible piezoelectric composite, made from Lead Zirconate Titanate(PZT) powder and Unsaturated polyester (UPE) resin, was doped with small amount of carbon semiconductor powder. The piezoelectric strain coefficient (d 33 ) and the dielectric behavior have been studied for this ceramic/polymer composite. The dielectric constant processes of the composite were observed to be dominated by those of undoped ceramic-polymer. The practical results of PZT/UPE/C with ratio 49/50/1 adding a semiconductor phase in the composite showed piezoelectric strain coefficient can be controlled and a continuous electric flux path could be created between the PZT grains. This composite may be poled at low voltage and in shorter time compared with composites without a conductive phase.
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