The phase equilibria in the Tl-S-I system and electrical properties of the Tl6SI4 and TlS compounds

• Published in: Journal of alloys and compounds 2019-03, Vol.776, p.495-503
• Main Authors: Babanly, Dunya M., Aliev, Ziya S., Huseynov, Qorkhmaz M., Asadov, Salim M., Mustafaeva, Solmaz N., Tagiyev, Dilgam B.
• Format: Article
• Language: English
• Subjects: Chalcohalides; Charge transfer; Differential thermal analysis; Diffraction; Electric measurements; Electric properties; Electrical properties; Fermi level; Frequency ranges; Heat conductivity; Liquidus; Localized states; Nomograms; Phase equilibria; Radiation detectors; Ternary systems; X ray powder diffraction; X-ray diffraction
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2018.10.220

The phase equilibria in the ternary Tl-S-I system were investigated experimentally by means of powder X-ray diffraction (PXRD) and differential thermal analysis (DTA). Five isopleth sections, liquidus surface projection and room temperature isothermal section were constructed based on experimental data. dc-and ac-electric properties of the TlS and Tl6SI4 crystals were studied within the temperature and frequency ranges from 120 K to 300 K and from 50 kHz to 35 MHz, respectively. The hopping mechanism for charge transfer over the localized states near the Fermi level was established at low temperatures and high frequencies for these compounds. The density and energy scatter of the states which are located in the vicinity of the Fermi level as well as the average time and distances of jumps were estimated for the title compounds. •The self-consistent phase diagram of the Tl–S–I system is constructed.•The existence of the wide immiscibility fields was revealed.•dc-and ac-electric properties for the TlS and Tl6SI4 crystals were studied.