CHARGE-FIELD HYSTERESIS OF BATIO3 - PVDF COMPOSITES

Hysteresis phenomena in BaTiO3: PVDF composites with different weight fractions of BaTiO3 and PVDF were studied in the temperature range 20- 180-degrees-C. A sinusoidal electric field of up to 100 kV mum-1 at 50 Hz was used. The saturation polarization, P(sat), remanant polarizati on, P(r), and coercive field, E(c), were observed to increase with inc reasing ceramic content of the composite samples. An increase of polar ization with temperature was observed for all composites up to 80-degr ees-C. This has been explained on the basis of an increase in the cond uctivity of the PVDF phase.