Piezoelectric and dielectric properties of (K0.44Na0.52Li0.04)(Nb0.86Ta0.10Sb0.04)O3–PVDF composites

(Li, Ta, Sb) modified sodium potassium niobate/poly(vinylidene fluoride) [(K0.44Na0.52Li0.04)(Nb0.86Ta0.10Sb0.04)O3–PVDF] 0-3 composites were prepared by a cold press technique, and their piezoelectric and dielectric properties were characterized. All composites exhibited good dispersion of ceramic particles in the polymer matrix. The piezoelectric and dielectric constants were found to be enhanced as the concentration of sodium potassium niobate increases. Even though the process is simple, the composite prepared in this study showed better piezoelectric and dielectric properties than PZT–polymer composites. At room temperature, a (K0.44Na0.52Li0.04)(Nb0.86Ta0.10Sb0.04)O3–PVDF (7:3) composite revealed a relative dielectric constant, ɛr = 166, piezoelectric constant, d33 = 33 pC/N and coercive field, Ec = 5 kV/cm.