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<p>The Cu<sub>2</sub>S-Ag<sub>2</sub>S-GeS<sub>2</sub> (A) system is of interest for the preparation of copper–silver-substituted solid solutions based on ternary compounds possessing a number of interesting functional properties. This paper presents the results of a detailed experimental study of phase equilibria in this system using the DTA/DSC and X-ray diffraction methods. A new refined version of the T-x diagram of the Ag<sub>2</sub>S-GeS<sub>2</sub> boundary system is presented. A new picture of phase equilibria in the system (A) is obtained, including diagrams of solid-phase equilibria at 300&#xa0;K and 750&#xa0;K, a projection of the liquidus surface of the system, as well as some polythermal sections and isothermal sections of the phase diagram at 1200, 1100 and 1000&#xa0;K. It is established that the quasi-binary system Ag<sub>2</sub>S-GeS<sub>2</sub> is characterized by the formation of two intermediate compounds, Ag<sub>8</sub>GeS<sub>6</sub> and Ag<sub>2</sub>GeS<sub>3</sub>. The first melts congruently at 1220&#xa0;K and undergoes a polymorphic transformation at 495&#xa0;K. The second is formed as a result of a peritectic reaction at 895&#xa0;K. System (A) is characterized by the formation of continuous solid solutions between the high-temperature cubic modifications of Cu<sub>8</sub>GeS<sub>6</sub> and Ag<sub>8</sub>GeS<sub>6</sub>, limited solid solutions based on their low-temperature modifications, and Cu<sub>2</sub>GeS<sub>3</sub> and Ag<sub>2</sub>GeS<sub>3</sub> compounds. In the subsolidus region of system (A), phase transformations associated with the polymorphism of binary and ternary compounds are observed.</p>

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Phase Equilibria and Copper–Silver-Substituted Solid Solutions in the Cu2S-Ag2S-GeS2 System

  • 期刊论文

  • 发表日期：

    2026年5月18日

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  • Samira Z. Imamaliyeva,
  • Vusala A. Abbasova,
  • Kamala N. Babanly,
  • Ilaha F. Huseynova,
  • Matanat A. Mahmudova,
  • Vladimir P. Zlomanov,
  • Mahammad B. Babanly

摘要

The Cu2S-Ag2S-GeS2 (A) system is of interest for the preparation of copper–silver-substituted solid solutions based on ternary compounds possessing a number of interesting functional properties. This paper presents the results of a detailed experimental study of phase equilibria in this system using the DTA/DSC and X-ray diffraction methods. A new refined version of the T-x diagram of the Ag2S-GeS2 boundary system is presented. A new picture of phase equilibria in the system (A) is obtained, including diagrams of solid-phase equilibria at 300 K and 750 K, a projection of the liquidus surface of the system, as well as some polythermal sections and isothermal sections of the phase diagram at 1200, 1100 and 1000 K. It is established that the quasi-binary system Ag2S-GeS2 is characterized by the formation of two intermediate compounds, Ag8GeS6 and Ag2GeS3. The first melts congruently at 1220 K and undergoes a polymorphic transformation at 495 K. The second is formed as a result of a peritectic reaction at 895 K. System (A) is characterized by the formation of continuous solid solutions between the high-temperature cubic modifications of Cu8GeS6 and Ag8GeS6, limited solid solutions based on their low-temperature modifications, and Cu2GeS3 and Ag2GeS3 compounds. In the subsolidus region of system (A), phase transformations associated with the polymorphism of binary and ternary compounds are observed.