E. V. Andreev

The reason for division of polarization relaxation processes into strong and weak

It is established that growth of through electroconductivity can affect differently the type of frequency dependences of a tanδ dielectric losses. It depends on whether the relaxation polarization process in the investigated dielectric is strong or weak. Division of relaxation processes into strong and weak is determined by the contribution of through conductivity to tanδ.

A simple geometrical method for classifying relaxation polarization processes

We present a simple geometrical method for classifying the relaxation polarization processes developing under conditions of substantial through electroconductivity. Qualitative classification criteria are supported by quantitative consideration. Results correspond to those earlier obtained in stricter ways. The method is easily extended to Debye relaxation polarization processes.

Effect of the Conductivity on Dielectric Spectra at the Relaxation Process with the Fröhlich Relaxation Times Distribution

The effect of conductivity on dielectric spectra of relaxing polarization processes described by the Fröhlich relaxation times distribution is studied. It is shown that in this case the dielectric relaxation processes subdivide into strong and weak ones. Borders between these relaxation processes are established. The physical reason of the division of the relaxation processes is determined.

The effect of conductivity on describing the non-debye relaxation processes in dielectrics

The distributions and integrated distribution of Cole-Cole and Dawidson-Cole relaxators are described. Based on the effect of conductance on the frequency dependences tanδ, the processes of relaxation polarization in dielectrics with such relaxators can be divided into two categories: strong and weak. In the development of strong processes, the increase in flow-through conductivity does not lead to the disappearance of extrema in frequency dependences tanδ.

Relaxation processes in non-Debye dielectrics

The specific features of the relaxation processes in non-Debye dielectrics have been investigated. The nature of the difference between the relaxation frequencies of the dielectric constant and dielectric loss (conductivity) has been explained. It has been shown that the average relaxation frequency of the conductivity is considerably (in some cases, by several orders of magnitude) higher than the relaxation frequency of the dielectric constant owing to an increase in the conductivity spectra of the statistical weight of the relaxation processes with short relaxation times.

Negative Capacity of a Dielectric as a Result of the Development of Relaxation Polarization

The reasons for the emergence of negative capacitance in matter are discussed. The relaxation polarization in matter, accompanied by the creation of an electric field of the inverse directivity, is named one of the possible reasons for the emergence of a negative capacitance. This field can appear in local areas of a substance after development of the polarization of ionic displacement. Calculated dielectric spectra of matter characteristic of such relaxation polarization are presented.

Impedance Description of the Processes of Electromigration in a Substance

Equivalent electrical circuits for all types of electromigration are proposed: pass-through conductivity, fast polarization processes, and relaxation polarization. The principle of the superposition of currents allows circuits to be designed with the simultaneous development of several processes of electromigration. The possibility of identifying the processes of electromigration developing in a substance from the experimental impedance spectra is discussed.

Strong relaxation polarization in a double-layer capacitor

In dielectrics, strong relaxation polarizations develop that contribute much to the polarization of the substance. Such great contributions should be expected in heterogeneous dielectrics. Relaxation polarization is studied in the simplest of heterogeneous dielectrics: a double-layer capacitor. The areas of concentration of the development of strong relaxation polarizations, the locations of which depend on the ratios of permittivities and the through electrical conductivities of the layers, are determined. The transition to strong relaxation polarization in this case also occurs in accordance with criteria developed earlier.

Determining the form of a relaxator distribution by extrapolation

AbstractА new way of determining types of relaxator distribution and their parameters is proposed. It is based on calculating the slopes of high-frequency and low-frequency asymptotes in the frequency dependences of the real and imaginary parts of complex dielectric permittivity and conductivity in dielectrics with polarization relaxation.

Determining the relaxation polarization parameters in dielectrics with high electrical conductivity

In dielectrics with high steady leakage of conductivity, the frequency–temperature dependences of the dielectric loss tangent generally allow us to determine the relaxation time and activation energy of relaxation process only when they are strong. With weak relaxation processes, there are no extrema in the frequency dependence of the dielectric loss tangent. In such cases, the parameters of the relaxation processes are initially determined from the frequency behavior of the imaginary parts of the electrical module or impedance. However, the frequency dependences of these quantities when there is electrical conduction can contain three extrema. Identifying the maxima associated with relaxation polarization therefore requires additional research.