Blurred relaxation spectra in dielectric materials
DOI:
https://doi.org/10.3103/S0735272722050016Abstract
This paper presents a substantiation of relaxation model of dielectric spectra that is based on Debye’s assumption about the dispersion of dielectric permittivity. According to this assumption the electric polarization of polar complexes is lagging at high frequencies of electric field that results in the reduction of dielectric permittivity, while the dielectric loss coefficient achieves its maximum. The paper considers an elementary model of dielectric relaxation. It has been shown that in processing of data of dielectric dispersion under an assumption of single time of relaxation, the accuracy of measurements should be very high. The relaxation spectrum of permittivity dispersion is found to be low-sensitive to the distribution or to interaction of relaxation oscillators. The existing approaches are described for explaining the blurring of dielectric spectra. They include empirical models of Cole–Cole, Fuoss–Kirkwood, Cole–Davidson, and Havriliak–Negami. The paper presents the analysis of the specified models and provides their advantages and disadvantages. A new model (non-empirical) approach is proposed for describing the extended dielectric relaxation spectra. The new approach is applied for materials with uniform and Gaussian distribution of frequencies of relaxation oscillators.
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