Effects of BaTiO_3 on dielectric behavior of BaTiO_3-Ni-polymethyl methacrylate composites

摘要

Effects of ferroelectric BaTiO_3 particles were investigated on the dielectric behavior of BaTiO_3-Ni-polymethyl methacrylate composites fabricated by a two-step mixing and hot-molding method. The percolation power law in the smearing region was employed to explain the experimental results. The composites exhibit the dependence of the dielectric constant, dielectric loss, and percolation threshold on the concentration and particle size of BaTiO_3. The results suggest that BaTiO_3 particles play an important role in increasing the percolation threshold and the smearing region as well as the dielectric constant of BaTiO_3-Ni-polymethyl methacrylate composites.