Characterisation of epoxy/BaTiO3 composite processed by dipping for integral capacitor films (ICF)

L RAMAJO,; M.M. REBOREDO,; M.S. CASTRO

JOURNAL OF MATERIALS SCIENCE

Springer

Año: 2007 vol. 42 p. 3685 - 3691

0022-2461

The dielectric behaviour of composite materials (epoxy resin – barium titanate) was analysed as a function of ceramic content. Epoxy and Nb2O5-doped BaTiO3 were chosen because of their good dielectric properties. Epoxy was diluted using tetrahydrofuran as solvent in order to reduce matrix viscosity and to facilitate the mixing step. Ceramic particles were mixed with the resin. Dipping technique was used to obtain the composite films onto glass plates on which gold electrodes were deposited by sputtering. Dielectric measurements were performed from 25 Hz to 1 MHz and 20ºC to 120ºC. It was found that the final materials had high permittivities and a strong dependence with the filler concentration. Electrical relaxation was generated by resin dominions detected in the composite and it was influenced by temperature.