Dielectric properties of PVDF/0.5(Ba0.7Ca0.3)TiO3-0.5Ba(Zr0.2Ti0.8)O3 composites

Ceramic powder of 0.50(Ba0.7Ca0.3)TiO3-0.50Ba(Zr0.2Ti0.8)O-3(BCZT50) at morphotropic phase boundary composition was prepared usingsolid-statesynthesis technique followed by extensive high energy ball milling. The crystal symmetry, space group and unit cell dimensions were determined from the X-raydiffraction data of BCZT50 using FullProf software andthe average crystallite size was estimated using Williamson-Hall approach. FTIR spectra confirmed the formation of perovskite type solid solutions. The prepared ceramic powder was utilized to prepare lead-free (1-x)PVDF/xBCZT50 ceramic-polymer composites with x = 0.025, 0.05, 0.10, 0.15, 0.20, 0.25 were prepared using melt-mixing technique. The distribution of BCZT50 particles in the PVDF matrix were examined using anoptical microscope. Filler concentration dependent real and imaginary parts of dielectric constant data followed exponential growth types of variation. The low value of tan delta(similar to 10(-2)) can be advantageous forsensing/detectionapplications.