Mechanical and Dielectric Behaviour of CaCu 3 Ti 4 O 12 and Nb Doped CaCu 3 Ti 4 O 12 Poly(vinylidene fluoride) Composites

Abstract

PVDF has been reinforced with different amount of CaCu 3 Ti 4-5 x /4 Nb x O 12 with x = 0.05 powder prepared by solid state ceramic method. Composites were prepared by melt extrusion method. Phase composition was studied using powder X-ray diffraction (XRD). Microstructural, dielectric, and mechanical properties have also been studied. These composites have Young’s modulus more than that of pure PVDF. Two dielectric relaxations, one at low frequency and the other at high frequency, have been observed in these composites. Dielectric relaxation at low frequencies is of Maxwell-Wagner type while the one observed at high frequency is due to hopping of electrons among different valent states of transition metal ions. Nature of dielectric relaxation has been analysed using H-N function.