Phase Relations and Crystallization Processes in the Ag2Se-AgI-GeSe2 System
Journal of Phase Equilibria and Diffusion, vol.47, no.3, pp.278-288, 2026 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 47 Issue: 3
- Publication Date: 2026
- Doi Number: 10.1007/s11669-026-01258-y
- Journal Name: Journal of Phase Equilibria and Diffusion
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, Chemical Abstracts Core, Compendex, INSPEC, Academic Search Ultimate (EBSCO), Engineering Source (EBSCO), Materials Science & Engineering Collection (ProQuest), Technology Collection (ProQuest)
- Page Numbers: pp.278-288
- Keywords: argyrodite family compounds, liquidus surface, phase equilibria, silver-germanium selenide-iodide, solid solutions
- Azerbaijan State University of Economics (UNEC) Affiliated: Yes
Abstract
Despite the potential of copper and silver halogen-containing argyrodites as environmentally friendly functional materials, phase equilibria in the corresponding systems remain virtually unstudied. In this study, phase equilibria in the quasi-ternary Ag2Se-AgI-GeSe2 system are investigated using differential thermal and X-ray phase analysis, as well as microhardness measurements. Solid-phase equilibria diagrams at 300 and 750 K, a liquidus surface projection, and several polythermal sections of the phase diagram are constructed. The primary crystallization fields of four phases, including ion-conducting solid solutions of the Ag8−xGeSe6−xIx (δ-phase), were determined. The presented polythermal sections of the phase diagram clearly demonstrate the processes of phase crystallization from the melt. The relatively large primary crystallization area of the δ-phase facilitates the growth of its single crystals with various compositions by directional solution-melt crystallization over a wide range of compositions and temperatures.