Effects of BaTiO3 on dielectric behavior of BaTiO3–Ni–polymethyl methacrylate composites

Abstract

Effects of ferroelectric BaTiO3 particles were investigated on the dielectric behavior of BaTiO3–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 BaTiO3. The results suggest that BaTiO3 particles play an important role in increasing the percolation threshold and the smearing region as well as the dielectric constant of BaTiO3–Ni–polymethyl methacrylate composites.

Experimental and theoretical dielectric studies of PVDF/PZT nanocomposite thin films

“…To achieve various performance objectives, high-dielectric-constant ferroelectric ceramics such as Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 (PMN-PT) [5], Pb(Zr,Ti)O 3 (PZT) [6], LTNO [7], CaCu 3 Ti 4 O 12 (CCT) [8] and BaTiO 3 (BT) [9] have been used as fillers in polymers by previous researchers. Similarly, metallic fillers have also been used to achieve ultrahigh dielectric constants in metal-polymer composites or three-phase composite systems [10][11][12]. The high dielectric constant of the ceramic allowed for a high dielectric constant and a strong piezoelectric effect in the composite for moderate volume fractions of the ceramic filler.…”

Enhanced permittivity by the adhesion of conducting and low‐loss insulating ceramics in polystyrene

“…As the volume fraction of LSCO increased, the cluster of LSCO merged, and there was a continuous path of the adjacent site across the system. Generally, all percolative composites have a small smearing region [3][4][5][6][7][8][9][10][11][12] (V c À V % 0.03, where V and V c are the volume fractions of the conducting filler below and at percolation, respectively). However, as shown in Figure 2, the relative permittivity increased from 183 to 11,713 with an increase of the volume fraction of LSCO from 0.23 to 0.50 in this three-phase composite.…”

“…Generally, all ceramic-metal and polymer-metal composites have very narrow smearing regions. [3][4][5][6][7][9][10][11][12] It was reported that the addition of ceramic to polymer-metal composites isolates the metal particles from the clusters, which results in the expansion of the smearing region. 22 As a result, more metal particles can be incorporated into the composites.…”

“…19 Three-phase composites consisting of a polymer, ceramic, and metal have attracted significant attention because of their high relative permittivity and low processing temperature. 2,5,[20][21][22][23][24] In this article, we report an enhancement in the relative permittivity of polymer-based threephase composites by the adhesion of conducting and insulating ceramics. In these three-phase composites, Ca[(Li 1/3 Nb 2/3 ) 0.8 Ti 0.2 ]O 3Àd (CLNT) was taken as the low-loss dielectric because it shows excellent microwave dielectric properties, [relative permittivity, e r ¼ 38, dielectric loss, tan d ¼ 10…”

“…2 The integration of passive components in printed circuit boards offers a significant reduction in size, improved electrical performance, and reliability. In the context of high-permittivity composites, several ceramic-metal, [3][4][5][6][7] polymermetal, [8][9][10][11][12] and polymer-ceramic [13][14][15][16] composites have been extensively studied. However, a high processing temperature limits the ceramic-metal composites in printed circuit board applications.…”