Abstract
The results of the study of temperature-frequency spectra of the complex dielectric permittivity of the LuFe2O4 multiferroic in the range of temperatures 100 – 400 K and frequencies 20 Hz – 120 MHz are presented. Peculiarities were found in the form of a change in the sign of the temperature coefficient of dielectric constant, as well as in the form of maxima and minima of ac conductivity in the temperature range ~ 150 - 350 K and frequencies ~ 30 - 120 MHz. These features are due to independent resonant mechanisms: coincidence of the frequency of the measuring ac voltage with the frequency of electron hopping during the realization of hopping conduction; the proximity of the period of the measuring signal to the time of formation of the barrier layer at the boundary of contact with the sample; the approximation of the ac frequency of the external field to the frequency of the structural elements of the sample.
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