Azerbaijan National Academy of Science

Doctor of Physics and Mathematics, professor 

1. It has been established that the features observed in the temperature dependence of the electrical conductivity (σ(T)) of samples of solid solutions of the TlSe1-xS2x system irradiated with γ-quanta above room temperature are associated with the transition of the crystal to the superionic state. A mechanism was proposed to explain the observed nature of the conductivity, and it was shown that the observed ionic conductivity is associated with the diffusion of Tl+ ions over vacancies in the thallium sublattice.

2. The spectra of the complex impedance of the initial and γ-irradiated solid solutions of the TlSe1-xS2x system were studied. According to the curves of the impedance hodogram, it is determined that the diffusion impedance of Warburg appears in the γ-irradiated samples. The rays in the impedance diagram are related to the Warburg diffuse impedance and show that the sinusoidal signal from ion mixing in the measured frequency range does not reach the boundary of the diffusion layer.

3. The electrical conductivity of layered and chain TlBX2 crystals (B = In, Ga; X = S, Se, Te) irradiated at various doses and solid solutions based on them in the temperature range 100–300 K was studied, and the temperature ranges of hopping conductivity were determined. Based on the Mott approximation, it was found that the values of the hopping conductivity parameters change significantly depending on the composition and dose of γ-irradiation.