Influence of the electrical conductivity on dielectric characteristics of a triglycine sulfate crystal over a wide frequency range

The dielectric spectra of ferroelectric triglycine sulfate crystals were measured in the frequency range from 10 to 10$^{11}$ Hz and analyzed based on the concept of a significant contribution of the conductive component to the dielectric response of ferroelectrics. Images of lenticular ferroelectric domains in sulfate triglycine crystals were obtained using scanning spreading resistance atomic force microscopy, and background currents (10$^{-14}$ A) and currents at domain walls (10$^{-12}$ A) were measured. It was shown that the inclusion of the contribution from the electrical conductivity to the dielectric spectra is in good agreement with the experimental data and provides additional information on the temperature dynamics of the domain structure.