THE AV–BVI–I TERNARY SYSTEMS: A BRIEF REVIEW ON THE PHASE EQUILIBRIA REVIEW

This paper presents a brief review on the ternary phase equilibria in the ternary AV–BVI–I systems (AV = Sb, Bi; BVI = S, Se, Te). These systems includes the series of ternary compounds those are very attractive source materials for photo-, thermos- and ferroelectric energy transformation along the recently discovered semiconductors that exhibit Rashba-type spin splitting in their surface states. In the Rashba semiconductors, a unique toroidal 3D Fermi surface appears on the crystal surface, which leads to unusual properties that make it possible to realize unique electronic devices based on these compounds. The thorough knowledge on the ternary phase diagram of these systems shed light on the chemical and structural design of new multifunctional materials with tunable properties. This knowledge is very important whenfocusing on the chemistry of such multifunctional materials based on complex element systems. REFERENCES Audzijonis A., Sereika R., Ћaltauskas R. Antiferroelectric phase transition in SbSI and SbSeI crystals. Solid State Commun., 2008, v. 147(3–4), pp. 88–89. https://doi.org/10.1016/j.ssc.2008.05.008 Łukaszewicz K., Pietraszko A., Kucharska M. Diffuse Scattering, Short Range Order and Nanodomains in the Paraelectric SbSI. Ferroelectrics, 2008, v. 375(1), pp.170–177. https://doi.org/1080/00150190802438033 Audzijonis A., Gaigalas G., Ţigas L., Sereika R., Ţaltauskas R., Balnionis D., Rëza A. Electronic structure and optical properties of BiSeI crystal. Phys. Status Solidi B, 2009, v. 246(7), pp. 1702–1708. https://doi.org/10.1002/pssb.200945110 Audzijonis A., Zaltauskas R., Sereika R., Zigas L., Reza A. Electronic structure and optical properties of BiSI crystal. J. Phys. Chem. Solids. 2010, v. 71(6), pp. 884-891. https://doi.org/10.1016/j.jpcs.2010.03.042 Ganose A. M., Butler K. T., Walsh A., Scanlon D. O. Relativistic electronic structure and band alignment of BiSI and BiSeI: candidate photovoltaic materials. J. Mater. Chem. A, 2016, v. 4(6), pp. 2060-2068. https://doi.org/10.1039/c5ta09612j Gerzanich E.I., Fridkin V.M. Ferroelectric materials of type AVBVICVII. Moscow, Nauka Publ., 1982. (in Russ.) Pierrefeu A., Steigmeier E. F., Dorner B. Inelastic neutron scattering in SbSI near the ferroelectric phase transformation. Phys. Status Solidi B, 1977, v. 80(1), pp. 167–171. https://doi.org/10.1002/pssb.2220800119 Žičkus K., Audzijonis A., Batarunas J., Šileika A. The fundamental absorption edge tail of ferroelectric SbSI. Phys. Status