DIELECTRIC-RELAXATION IN BINARY-SOLUTIONS - THEORY AND EXPERIMENTAL RESULTS

In this paper we present a statistical model to describe the dielectri c behavior of binary solutions. The formal development is based on the introduction of a few dynamical parameters describing the interaction s occurring in the solution; these parameters enter in the rate equati ons for the dynamics of mixing. These equations, after suitable linear ization, are used as the starting point to obtain the dipole correlati on functions necessary to study the dielectric relaxation processes. T he model is able to indicate the conditions which a mixture composed o f two liquids with very different relaxation times must fulfill to pro duce a single relaxation time, as often experimentally observed. Some significant results reported in the literature are analyzed and explai ned and new experimental data are reported in order to test specific f eatures of the model. All tests carried out so far on binary solutions give a successful reproduction of experimental results. (C) 1998 Amer ican Institute of Physics. [S0021-9606(98)51815-6].