Dielectric behavior of three-phase percolative Ni–BaTiO3/polyvinylidene fluoride composites

Abstract

A three-phase percolative composite with a ferroelectric phase $({\mathrm{BaTiO}}_3)$ and metallic inclusions (Ni) embedded into polyvinylidene fluoride matrix was prepared by using a simple blending and hot-molding technique. Effective medium approximations and percolation theory were employed in order to design and describe the dielectric behavior of such three-phase composites. Our experimental results showed that the static dielectric constant of such a three-phase composite can reach above 800 when the Ni concentration is close to its percolation threshold. Such composites have a potential to become capacitors and can be easily fabricated into various shapes due to its flexibility.