Dielectric studies of PZT-polymer composites

Abstract

Lead zirconate titanate (PZT)/Nylon 66 composites having 3-3 connectivity have been prepared by a relatively simple fabrication process. The d.c. conductivity and dielectric constant were measured from 30 to 220° C at various frequencies (0.1, 1, 10, 100 kHz). The dielectric constant increased with increasing temperature and PZT-constant of the composite up to 50 vol% PZT, but later showed a decrease due to increase in porosity in the samples. The dielectric constant also increased rapidly at higher temperature (> 100°C) for lower frequencies (0.1 and 1 kHz) due to intergrain polarization. The dielectric loss increased with increasing temperature and with decreasing PZT content of the composite. D.c. conductivity increased continuously with increasing temperature.