BaTiO₃–Epoxy Composites for Electronic Applications

Abstract

A brief review related with dielectric properties of BaTiO 3 /epoxy composites is presented. The composites were obtained using the dipping technique. To facilitate the mixing and modify the filler surface, a solvent and a surface coupling agent were used. Intermediate and low concentrations of solvent and silane improved microstructure and dielectric properties of the composite material, whereas higher concentrations led to composites of poor quality. Finally, a model using finite elements was used, in order to predict the composite permittivity in relation to the percentage of filler. Model results were compared with the effective medium theory and experimental results.

Improved dielectric permittivity of NBCTO/epoxy composite films with low dielectric loss

“…From the obtained data shown in Fig. 5a, the dielectric permittivity of the composite films decreases in all the measuring frequency range due to the relaxation process type Debye [28]. However, the dielectric permittivity decreases slightly with increasing the frequency, and the stable dielectric permittivity may be attributed to the uniform distribution of NBCTO particles in the epoxy matrix.…”

Barium titanate/polyester resin nanocomposites: Development, structure-properties relationship and energy storage capability

“…Therefore, it is necessary to study the dielectric properties, the employed processing route, and the synergy of the composite's constituents before polymer matrix/high-k materials could be exploited in technological applications [18]. Current applications of this type of composites include multilayer ceramic capacitors (MLCC's), thermistors, electro-optic components, integrated capacitors, thin films electronic component materials, acoustic emission sensors, moreover they proved to be useful for the reduction of leakage currents [19]. Additionally, ceramic/ polymer nanocomposite can be exploited in the development of dielectric-based capacitors for energy storage in novel electronics used in electric vehicles, cellular phones, medical devices, wireless personal digital assistants etc.…”

Ceramic–polymer composites with improved dielectric and tribological properties for semi-active damping

“…The differences lie in the component suppliers, doped barium titanate, measuring frequencies or even testing temperatures. To handle the increased viscosity at high volume loading, solvents were used [26,28], leading to defects due to the solvent evaporation [28]. Also the use of coupling agents [28] lead to microporosity.…”

“…To handle the increased viscosity at high volume loading, solvents were used [26,28], leading to defects due to the solvent evaporation [28]. Also the use of coupling agents [28] lead to microporosity. The use of nano-sized particles [27] lead to lower permittivities due to the different phases in barium titanate.…”