Abstract
The equivalent generalised permittivity of a system composed of dielectric spheres in a conductive continuum is calculated. The diffusion effects are taken into account by characterising the continuous phase by its ion charges, mobilities and equilibrium concentrations. The results obtained, which reduce to the Maxwell-Wagner results in the limit of low diffusion at constant conductivity or large dispersion radii, do not agree with those deduced by Bonincontro et al (1980). They show the Maxwell-Wagner approximation always leads to an overestimation of both the dielectric increment and the relaxation time. These differences could be important in some cases of interest.
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