Phase Equilibria in Ag8SnS6 – Cu2SnS3 and Ag2SnS3 – Cu2Sn4S9 Systems

  • Vidadi A. Rzaguliyev Sumgait State University, 43rd block, Sumgait, AZ5008 Azerbaijan
  • Oruj S. Kerimli Institute of Catalysis and Inorganic Chemistry named after academician M. F. Nagiyev of the National Academy of Sciences of Azerbaijan, 113, Javid ave., Az 1143 Baku, Republic of Azerbaijan
  • Dilbar S. Ajdarova Institute of Catalysis and Inorganic Chemistry named after academician M. F. Nagiyev of the National Academy of Sciences of Azerbaijan, 113, Javid ave., Az 1143 Baku, Republic of Azerbaijan
  • Sharafat H. Mammadov Institute of Catalysis and Inorganic Chemistry named after academician M. F. Nagiyev of the National Academy of Sciences of Azerbaijan, 113, Javid ave., Az 1143 Baku, Republic of Azerbaijan https://orcid.org/0000-0002-1624-7345
  • Ozbek M. Aliev Institute of Catalysis and Inorganic Chemistry named after academician M. F. Nagiyev of the National Academy of Sciences of Azerbaijan, 113, Javid ave., Az 1143 Baku, Republic of Azerbaijan
Keywords: system, quasi-binary, solid solution, X-ray phase analysis, structure, eutectic.

Abstract

Purpose. Chalcostannates of copper and silver are among the important functional materials
of modern technology. Among them, there are materials with valuable semiconductor,
photosensitive, and thermoelectric properties. By complex methods of physical-chemical analysis
(differential thermal, X-ray phase, microstructural analysis, microhardness measurement, and
density determination) phase equilibria have been studied in systems Ag8SnS6–Cu2SnS3 and
Ag2SnS3–Cu2Sn4S9 and their T–x phase diagrams have been constructed.
Results. It was shown that the Ag8SnS6–Cu2SnS3 system is a quasi-binary cross-section of the
Ag2S–SnS2–Cu2S quasi-triple system and belongs to the simple eutectic type with limited
solubility regions based on the initial sulphides. The coordinates of the eutectic point are:
50 mol % Ag2SnS3 and T = 900 K.
The solubility based on Ag8SnS6 and Cu2SnS3 at the eutectic temperature stretches to 20 and
28 mol %, respectively. With decreasing temperature, the solid solutions decompose, and at
300 K they have values of 5 and 10 mol %. The phase transition a-Ag8SnS6 ↔ b-Ag8SnS6 occurs
at 410 K and has a eutectoid character. It was established that with an increase in the concentration
of Ag8SnS6 in solid solutions (Cu2SnS3)1–х (Ag8SnS6)х, the cubic lattice parameter increases
from a = 0.5445 nm (for pure Cu2SnS3) to a = 0.725 nm (for composition x = 0.1). The concentration
dependence of the lattice parameter on the composition is linear.
Conclusion. The Ag2SnS3–Cu2Sn4S9 system, due to the peritectic melting of Cu2Sn4S9, has a
complex character and is a partial quasi-binary section. The quasi-binary state is violated in the
range of 65–100 mol % Cu2Sn4S9 and above temperature 900 K. The part of the system in the
concentration range of 0–65 mol % Cu2Sn4S9, is of a eutectic type. Solid solutions based on
Ag2SnS3 – Cu2Sn4S9 are narrow and at 300 K they are 10; 2.5 mol %, respectively.

 

 

 

 

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Author Biographies

Vidadi A. Rzaguliyev, Sumgait State University, 43rd block, Sumgait, AZ5008 Azerbaijan

graduate student, Sumgait State University, Sumgait, Azerbaijan; e-mail: kerimli-64@mail.ru

Oruj S. Kerimli, Institute of Catalysis and Inorganic Chemistry named after academician M. F. Nagiyev of the National Academy of Sciences of Azerbaijan, 113, Javid ave., Az 1143 Baku, Republic of Azerbaijan

PhD (Chem.), Leading Researcher, Institute of Catalysis and Inorganic Chemistry
Azerbaijan National Academy of Sciences, Baku, Azerbaijan; e-mail: azxim@mail.ru

Dilbar S. Ajdarova, Institute of Catalysis and Inorganic Chemistry named after academician M. F. Nagiyev of the National Academy of Sciences of Azerbaijan, 113, Javid ave., Az 1143 Baku, Republic of Azerbaijan

Dr. Chem. Sci., Chief Researcher, Institute of Catalysis and Inorganic Chemistry
of Institute of Catalysis and Inorganic Chemistry, Azerbaijan National Academy of Sciences;
e-mail: azxim@mail.ru

Sharafat H. Mammadov, Institute of Catalysis and Inorganic Chemistry named after academician M. F. Nagiyev of the National Academy of Sciences of Azerbaijan, 113, Javid ave., Az 1143 Baku, Republic of Azerbaijan

PhD (Chem.), Associate Professor, Senior Researcher, Institute of Catalysis
and Inorganic Chemistry Azerbaijan Natio nal Academy of Sciences, Baku, Azerbaijan; е-mail:
azxim@mail.ru.

Ozbek M. Aliev, Institute of Catalysis and Inorganic Chemistry named after academician M. F. Nagiyev of the National Academy of Sciences of Azerbaijan, 113, Javid ave., Az 1143 Baku, Republic of Azerbaijan

Dr. Chem. Sci., Professor, Institute of Catalysis and Inorganic Chemistry Azerbaijan
National Academy of Sciences, Baku, Azerbaijan; e-mail: azxim@mail.ru

Published
2019-12-19
How to Cite
Rzaguliyev, V. A., Kerimli, O. S., Ajdarova, D. S., Mammadov, S. H., & Aliev, O. M. (2019). Phase Equilibria in Ag8SnS6 – Cu2SnS3 and Ag2SnS3 – Cu2Sn4S9 Systems. Kondensirovannye Sredy I Mezhfaznye Granitsy = Condensed Matter and Interphases, 21(4), 544-551. https://doi.org/10.17308/kcmf.2019.21/2365
Section
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