PHASE EQUILIBRIA IN THE Ag8SiTe6–Ag8GeTe6 SYSTEM

G. Ashirov

doi:10.32737/0005-2531-2022-1-89-93

Abstract

Phase equilibria in the Ag8SiTe6–Ag8GeTe6 system were experimentally investigated by means of differential thermal analysis and powder X-ray diffraction techniques. It was established that continuous series of solid solutions with SiGe substitution are formed in the system. T–x-diagram of the title system and concentration dependence of lattice parameters of the obtained solid solutions were plotted

Highlights

Binary and more complex chalcogenides of copper and silver are valuable functional materials [1–3]
It is known that the development of new multicomponent materials is based on data on the phase equilibria of the corresponding systems and the thermodynamic properties of phases formed in them
The study of phase equilibria in systems composed of synthetic analogues of argyrodite showed that in a number of such systems, for example Cu8GeS6–Cu8GeSe6, Ag8SnS6–Ag8SnSe6, Ag8GeS6–Ag8GeSe6, Ag8GeS6–Ag8SnS6, Ag8GeSe6–Ag8SnSe6 and

Summary

Introduction

Binary and more complex chalcogenides of copper and silver are valuable functional materials [1–3]. Recent studies [13–22] have shown that synthetic analogs of the argyrodite mineral with the general formula A8BIVX6 (where A – Cu, Ag; BIV – Si, Ge, Sn; X – S, Se, Te) have a number of valuable functional properties that are the subject of many research groups These compounds are environmentally friendly, and their constituent components are widely distributed and low-cost [23]. Starting compounds Ag8SiTe6 and Ag8GeTe6 were synthesized using high-purity elements (at least 99.999 wt.% purity) from the EVOCHEM ADVANCED MATERIALS GMBH (Germany). Both compounds were synthesized by fusion of simple substances in stoichiometric ratios in evacuated to ~10-2 Pa and sealed quartz ampoules (15 cm in length and 1.5 cm in diameter) at temperatures 50° higher than the melting points of the synthesized compounds. The X-ray patterns were indexed using the Topas V3.0 Software Bruker

Results and discussion

Conclusion

Applications of Chalcogenides