Abstract
Three-phase composites with enhanced dielectric permittivity and low dielectric loss were prepared by incorporating the giant dielectric permittivity material Na0.5Bi0.5Cu3Ti4O12 (NBCTO) and conductive Ag nanoparticles in Poly(vinylidene fluoride) (PVDF) polymer matrix by melt mixing and hot pressing process, in which the filler content (volume fraction) of Ag nanoparticles and NBCTO powders was set at 50vol% and PVDF was set at 50vol%. The structure and thermal stability of the composites were characterized using X-ray diffraction (XRD) and thermo-gravimetric analysis (TGA). Studies on the dielectric properties of composites in the frequency range from 10 to 106Hz showed that the Ag-NBCTO-PVDF composite exhibited high dielectric permittivity of 222.4 and low loss tangent of 0.32 at 1kHz when the content of Ag was 5vol%. A percolation threshold of fAg=5.9vol% was calculated through the percolation theory.
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