Dielectric behavior of 0-3 type piezoelectric composites

Dielectric absorption and thermally stimulated current measurements were performed for PPN-P(VDF/TFE) (polyvinylidene fluoride/tetrafluoroethylene) composites obtained by hot-pressing of PPN ceramic and PVDF powder. Dielectric dispersion was observed in the composites with the maximum of absorption in the range of approximately 10 MHz at room temperature. The dispersion is characterized by a broad relaxation-time distribution. Electrical transport in the composite at temperatures below approximately 370 K is influenced by relaxation processes of the polymer.<
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