Bi₂S₃-BaTiO₃/PVDF three-phase composites with high dielectric permittivity

Novel three-phase percolative composites, with a ferroelectrics phase (BaTiO₃) and semiconductor Bi₂S₃ nanorods dispersed in a PVDF matrix, have been prepared using a simple blending and hot-pressing method. The variation of dielectric properties of the Bi ₂S₃-BaTiO₃/PVDF composites with frequency and temperature was also studied in detail. The composites are demonstrated to have significantly higher dielectric constants than those of bulk BaTiO ₃/PVDF, with a quite low percolation threshold. They are promising dielectric composites with high dielectric constants and low inorganic filler contents.