Antiresonant dielectric spectra: Theory and experiment

It is established that, in ceramics based on solid solutions of BiFeO$_{3}$–SrTiO$_{3}$ and BiFeO$_{3}$–BaTiO$_{3}$ multiferroics, antiresonant dielectric spectra–a kind of spectra not described in literature–are possible in addition to relaxation and resonant spectra. Antiresonant dielectric spectra are simulated, and experimental data confirming the simulation results are obtained. It is shown that the antiresonant spectra are characterized by a large activation energy ($U>$ 1 eV). A relationship between the antiresonant spectra and hopping conductivity is supposed.