CERAMIC-POLYMER DIELECTRIC COMPOSITES PRODUCED VIA DIRECTIONAL FREEZING

摘要

The freeze casting method was successfully used to create ceramic-polymer composites with the two phases arranged in an electrically parallel configuration. The result is a novel composite that exhibits dielectric constant (K) of up to 4000 for PMN-10PT while maintaining low dielectric loss (< 0.05). The finished composites not only exhibit the high dielectric constant of ferroelectric ceramics but maintain the flexibility and ease of postprocessing handling of polymer materials. Graceful failure of these samples was observed during dielectric breakdown testing as well as high d_(33) and good hysteresis behavior. In fact the PZT-5A samples had a d_(33) value of ～250 pC/N and a remnant polarization of 15 μC/cm~2.