Study of Electrical Behaviors of PVDF/BiGdO3 Polymer Composite

Abstract

AbstractIn this communication, Polyvinylidene fluoride or polyvinylidene difluoride (PVDF) polymer matrix and 10 wt% Bismuth Gadolinium Oxide (BiGdO3) as the inorganic phase based polymer-inorganic composite is fabricated. The structural, electrical modulus, dielectric and impedance behaviors were analyzed for the PVDF/BiGdO3 polymer composite. The PVDF/BiGdO3 polymer composite exhibited attractive dielectric and impedance behaviors with very low tangent loss. The effect of Maxwell–Wagner–Sillars polarization arises because of the accumulation of charges at the phase boundaries and the lower conductive capacity in the polymer phase. The Nyquist plot is fitted with an equivalent circuit model {(CQR)(CR)}, for (CQR): C = bulk capacitance (Cb), Q = constant phase element, R = bulk resistance (Rb); whereas for (CR): C = grain boundary capacitance (Cgb), R = grain boundary resistance (Rgb). The value of Rb decreased from 8.985 × 104 Ω cm2 to 5.158 × 104 Ω cm2 with rising temperature. From the Nyquist plot, the negative temperature coefficient of resistance (NTCR) behavior of the composite was predicted.KeywordsPVDFBiGdOPolymer compositesRelaxation timeNyquist plot