Size-dependent low-frequency dielectric properties in the BaTiO_3/poly(vinylidene fluoride) nanocomposite films

摘要

Effects of inorganic nanoparticles size and thermal agitation on dielectric properties of BaTiO_3/ poly(vinylidene fluoride) (BT/PVDF) nanocomposite films at low frequency were studied. The dielectric properties of the BT/PVDF nanocomposite films with three kinds of diameters of BT nanoparticles loading at 50 vol. % were studied in a wide frequency range from 10~(-2)Hz to 10~7 Hz by two measured processes. A significant low-frequency dielectric permittivity increase and the difference in dielectric properties between two measured processes were discussed. Interfacial polarization, crystal phase effect, and thermal agitation are considered to analyze the significant increase and difference in dielectric behaviors.