Signs of low frequency dispersions in disordered binary dielectric mixtures (fifty fifty)
Abstract
Dielectric relaxation in disordered dielectric mixtures is presented by emphasizing the interfacial polarization. The obtained results coincide with and cause confusion with those of the low frequency dispersion behaviour. The considered systems are composed of two phases on twodimensional square and triangular topological networks. We use the finite element method to calculate the effective dielectric permittivities of randomly generated structures. The dielectric relaxation phenomena together with the dielectric permittivity values at constant frequencies are investigated, and significant differences of the square and triangular topologies are observed. The frequency dependent properties of some of the generated structures are examined. We conclude that the topological disorder may lead to the normal or anomalous low frequency dispersion if the electrical properties of the phases are chosen properly, such that for 'slightly' reciprocal mixture—when sgr_{1} Gt sgr_{2}, and epsi_{1} < epsi_{2}normal, and while for 'extreme' reciprocal mixture—when sgr_{1} Gt sgr_{2}, and epsi_{1} Lt epsi_{2}anomalous low frequency dispersions are obtained. Finally, comparison with experimental data indicates that one can obtain valuable information from simulations when the material properties of the constituents are not available and of importance.
 Publication:

Journal of Physics D Applied Physics
 Pub Date:
 February 2004
 DOI:
 10.1088/00223727/37/3/004
 arXiv:
 arXiv:condmat/0403244
 Bibcode:
 2004JPhD...37..334T
 Keywords:

 Condensed Matter  Disordered Systems and Neural Networks
 EPrint:
 13 pages, 7 figures