Dielectric behaviours of multi-doped BaTiO3/epoxy composites

Kuo, Dong‐Hau; Chang, C.T.; Su, Te-Yeu; Wang, Wun-Ku; Lin, Bin

doi:10.1016/s0955-2219(00)00327-7

Cited by 180 publications

(61 citation statements)

References 10 publications

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“…Incorporation of alumina (Al2O3), barium titanate (BaTiO3), titania (TiO2) and zirconia (ZrO2) into PI matrix were attempted.. [33,34] Several methods were employed in preparing these nanocomposites. It has been established that method of preparation affect the dielectric properties of these materials.…”

Section: Polyimide-ceramic Compositesmentioning

confidence: 99%

Polymer Dielectric Materials

Ahmad¹

2012

Dielectric Material

158

144

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Section: Polyimide-ceramic Compositesmentioning

confidence: 99%

Polymer Dielectric Materials

Ahmad¹

2012

Dielectric Material

158

144

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“…However, the dielectric constant of such polymer based composites is rather low (about 50) because of the lower dielectric constant of the matrix (usually below 10) [1][2][3][4][5] . For instance, in BaTiO 3 /epoxy composites, though BaTiO 3 has relatively high dielectric constant (>1000), the effective dielectric constant (ε eff ) of the composite was as low as 50, even when the highest possible volume fraction of ceramics was incorporated 2 . As the volume fraction of ceramics increased, the composite, unfortunately, lost its flexibility.…”

Section: Introductionmentioning

confidence: 99%

Dielectric behaviour of CaCu3Ti4O12-epoxy composites

et al. 2008

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The dielectric behavior of composite materials (epoxy resin -barium titanate and epoxy -CCTO) was analysed as a function of ceramic amount. Composites were prepared by mixing the components and pouring them into suitable moulds. In some compositions, the matrix was reduced by tetrahydrofuran (THF) incorporation. Samples containing various amounts of ceramic filler were examined by TG/DTA and scanning electron microscopy analysis. Dielectric measurements were performed from 20 Hz to 1 MHz and 30 to 120 °C. It was demonstrated that the epoxy -CCTO composites possessed higher permittivity than classic epoxy -BaTiO 3 composites. However, the low resin permittivity prevailed in the composite dielectric performance.

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“…The goal of the heat treatment is to obtain tetragonal phase BaTiO 3 because it has a higher dielectric constant than cubic phase BaTiO 3 , and the grain size has a major influence on the crystal structure [15,17,18]. The grain size of the BaTiO 3 fibers is affected by the heating rate.…”

Section: Sintering Effect On the Crystal Structure Of Barium Titanatementioning

confidence: 99%

Effect of high aspect ratio filler on dielectric properties of polymer composites: a study on barium titanate fibers and graphene platelets

Wang

Nelson

Miao

et al. 2012

IEEE Trans. Dielect. Electr. Insul.

107

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High aspect ratio fillers are predicted to increase the dielectric constant of polymer composites more efficiently than spherical fillers according to the rule of mixtures. Using high aspect ratio fillers is a promising route for creating high dielectric constant, low loss materials at a low filler volume fraction, for use as capacitor and electric field grading materials. In this work, two high aspect ratio fillers were mixed into a polymer matrix, and the dielectric properties of composites were studied. Barium titanate fibers were synthesized by electrospinning a sol-gel, followed by a heat treatment to obtain a perovskite crystal structure. The heat treatment conditions were found to be crucial for obtaining tetragonal barium titanate fibers with high dielectric constant. Graphene platelets were prepared by a thermal shock method, which was found to result in a larger dielectric constant. A combination of barium titanate and graphene platelets yielded the highest dielectric constant when used in a polydimethyl siloxane matrix. The increase in dielectric loss over the pure matrix was small when the volume fraction was below the percolation threshold of graphene platelets. Electric flux density-electric field (D-E) measurements showed a linear dielectric constant in barium titanate filled composites and higher loss when graphene was added. The ac breakdown strength was reduced compared to the neat polymer and was affected by filler aspect ratio. The mechanisms that lead to the observed phenomena are discussed.

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Dielectric behaviours of multi-doped BaTiO3/epoxy composites

Cited by 180 publications

References 10 publications

Polymer Dielectric Materials

Polymer Dielectric Materials

Dielectric behaviour of CaCu3Ti4O12-epoxy composites

Effect of high aspect ratio filler on dielectric properties of polymer composites: a study on barium titanate fibers and graphene platelets

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