Dielectric property of nickel/calcium copper titanate/Polyvinylidene Fluoride composite

This paper reports a nickel (100nm)/calcium copper titanate (1um)/ Polyvinylidene Fluoride three-phase composite prepared through a simple blending and hot-molding procedure. The microstructure and dielectric properties of the composites were analyzed using scanning electron microscope (SEM), and impedance analyzer. The results show that the dielectric constant ε_r rises from 49 to 140 with the loss tangent increasing from 0.23 to 0.31 when the volume fraction of nickle increases from 0% to 22% at 100 Hz and room temperature. The reasons for the high dielectric constant and relatively low loss of the three-phase composite were discussed in view of several aspects. Percolation theory, Maxwell-Garnett model (M-G) and effective medium theory model (EMT) were employed to analyze the dielectric behavior of composites.