ELECTRIC AND MAGNETIC BEHAVIOR RESPONSE OF Fe3O4/EPOXY COMPOSITES

L. RAMAJO; A. CRISTÓBAL; J.M. PORTO LOPÉZ; M. REBOREDO; M. CASTRO

Rio de Janeiro, Brasil

Congreso; COMAT 2007; 2007

Universidad Federal de Rio de Janeiro

Magnetic and dielectric properties of Fe3O4 epoxy resin composites were studied as a function of Fe3O4 concentration. The powder was milled using a planetary mill in order to reduce the particle size and assure a good dispersion. B.E.T. area of particles was determined, and lattice parameters were obtained by XRD. Composites were prepared pouring them into suitable moulds. Dielectric measurements were performed at different frequencies and temperatures, while magnetic properties were assessed at room temperature. It was found that permittivity was strongly dependent on the filler concentration and frequency, while electrical relaxation was generated by resin dominions detected in the composite and it was influenced by temperature.