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<p>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 Ag<sub>2</sub>Se-AgI-GeSe<sub>2</sub> system are investigated using differential thermal and X-ray phase analysis, as well as microhardness measurements. Solid-phase equilibria diagrams at 300 and 750&#xa0;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 Ag<sub>8−x</sub>GeSe<sub>6−x</sub>I<sub>x</sub> (<i>δ</i>-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 <i>δ</i>-phase facilitates the growth of its single crystals with various compositions by directional solution-melt crystallization over a wide range of compositions and temperatures.</p>

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Phase Relations and Crystallization Processes in the Ag2Se-AgI-GeSe2 System

  • 期刊论文

  • 发表日期：

    2026年6月1日

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  • Ilaha Firudin Huseynova,
  • Nurtan Asef Bayramova,
  • Samira Zakir Imamaliyeva,
  • Marina Bulanova,
  • Isfandiyar Javid Alverdiyev,
  • Mahammad Baba Babanly

摘要

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.