Dielectric losses in statistical mixtures |
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Authors: | A V Turik S I Garmashov |
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Institution: | (1) Faculty of Physics, Vilnius University, 9 Sauletekio str., 10222 Vilnius, Lithuania;(2) Institute of Solid State Physic, University of Latvia, 8 Kengaraga str., 1063 Riga, Latvia |
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Abstract: | The specific features of the dielectric spectra of statistical mixtures in the form of heterogeneous systems with spherical
particles chaotically arranged in the space have been investigated. The distribution function of relaxation times f(τ) has been restored. It has been established that the relaxation times are continuously distributed within a wide interval
τ1, τ2]. Different methods for broadening the relaxation time distribution interval and approximating the relaxation time distribution
function f(τ) have been analyzed. It has been demonstrated that f(τ) is a nonmonotonic function with two maxima at the boundaries and a minimum in the vicinity of the midpoint of the interval
τ1, τ2]. These features of the relaxation time distribution function are responsible for the large difference between the average
relaxation frequencies of the permittivity and the dielectric loss (electrical conductivity). |
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