Dielectric properties of PDMS composites filled with SrTiO 3 nanoparticles
Résumé
This paper deals with the dielectric properties of PDMS nanocomposites filled with SrTiO 3 nanoparticles. The investigations were performed over a very broad range of frequencies (20 Hz-3 THz). Almost no dielectric dispersion was observed in all the composites at room temperature over the entire range of measurement frequencies, and the dielectric losses were also very low under these conditions (less than 1.9). The dielectric dispersion was observed at lower temperatures (below 280 K), due to relaxation at the PDMS/SrTiO 3 interface and in the bulk polymer. The relaxation time for both cases followed the Vogel-Vulcher law, while the freezing temperature was substantially lower for relaxation at the PDMS/SrTiO 3 interface.
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