Enhanced Initial Permeability and Dielectric Constant in a Double- Percolating Ni0.3Zn0.7Fe1.95O4-Ni- Polymer Composite

Abstract

A novel, three‐phase, double‐percolating composite with NiZn‐ferrite particles and nickel particles embedded in a poly(vinylidene fluoride) matrix is prepared by a simple hot‐pressing method. Large ferrite particles in the composite not only act as a magnetic phase, thus endowing the composite with a high initial permeability, but also present (in a high volume fraction) a discrete (non‐percolating) phase, confining polymer and metallic particles into a continuous double‐percolating structure of low volume fraction. In particular, a large enhancement in both the initial permeability and the dielectric constant of the three‐phase composites is observed, which is due mainly to the addition of a small number of nickel particles that act as both magnetic and percolative metallic phases. The dielectric and magnetic behavior observed in the three‐phase composites can be explained by effective‐medium and percolation theories.

Dielectric and current–voltage characteristics of flexible Ag/BaTiO3 nanocomposite films processed at near room temperature

“…As expected, the dielectric constant tends to increase gradually with increasing the volume fraction of Ag nanoparticle by reaching $303 with the 30 vol% Ag, suggesting the percolation transition with a higher content of Ag. 15,18 The increase is very substantial compared to the value of $36.4 for the sample without Ag. It seems that the Ag nanoparticles are surrounded by the polymer matrix and thus their conductive paths are conned in the composite structure up to the maximum of 30 vol% Ag.…”

“…It seems that the Ag nanoparticles are surrounded by the polymer matrix and thus their conductive paths are conned in the composite structure up to the maximum of 30 vol% Ag. 18,19 It is very noticeable that the dielectric loss values were maintained at the level of <0.1 regardless of Ag content (Fig. 5(b)).…”

Organic-Inorganic Rf Composites With Enhanced Permittivity by Nanoparticle Additions

“…Such composites, especially with low loss in the GHz region, are good candidates to fulfil the requirements of the electronic and telecommunication industry for embedded capacitors, capacitively coupled electrical solutions, antenna substrates and integrated RF devices for example. Thus they have been widely studied during recent years, especially 0-3 type composites that have gained special attention due to their easy and industrially viable fabrication methods [1][2][3][4]. Recently, BST-PPS, SrTiO 3 -POE and BZN-PTFE composites have been developed for microwave applications having micron size ceramic inclusions in a polymer host [5][6][7][8][9].…”

Frequency Variation of Complex Permeability in Dual Ferrite Filler - Single Polymeric Matrix Composites

“…A relative new composite is the hybrid composite material, which is obtained by using two or more different kinds of fillers in a single matrix [1,2]. Hybrids have a better all-round combination of properties than composites containing only a single filler type.…”

“…Composite materials based on ferrite filler and polymeric matrix have been a subject of considerable interest in the last years [1][2][3][4]. A relative new composite is the hybrid composite material, which is obtained by using two or more different kinds of fillers in a single matrix [1,2].…”