Phase equilibria and some properties of solid solutions of PbGa2S4–SmGa2S4 and PbGa2Se4–SmGa2Se4 systems

Ozbek M. Aliev; Dilbar S. Azhdarova; Reyhan M. Agayeva; Valida M. Raqimova

doi:10.17308/kcmf.2025.27/13293

Ozbek M. Aliev Institute of Catalysis and Inorganic Chemistry, 113 H. Javid ave., Baku AZ-1143, Azerbaijan https://orcid.org/0000-0002-6411-108X
Dilbar S. Azhdarova Institute of Catalysis and Inorganic Chemistry, 113 H. Javid ave., Baku AZ-1143, Azerbaijan https://orcid.org/0000-0002-8119-733X
Reyhan M. Agayeva Azerbaijan State Pedagogical University, 68 U. Hajibeyli st., Baku AZ-1000, Azerbaijan https://orcid.org/0000-0002-2924-3204
Valida M. Raqimova Institute of Catalysis and Inorganic Chemistry, 113 H. Javid ave., Baku AZ-1143, Azerbaijan https://orcid.org/0009-0008-9157-1592

DOI: https://doi.org/10.17308/kcmf.2025.27/13293

Keywords: System, Solid solution, Unit cell, Lattice parameter, Phase diagram

Abstract

Objectives: In connection with the transition to green energy, the search for, synthesis of, and investigation into alternative energy sources and the materials required for them are of great importance. One of the methods for obtaining such promising materials is the study of phase diagrams between isostructural compounds. In this regard, phase equilibria in the PbGa₂S₄–SmGa₂S₄ and PbGa₂Se₄–SmGa₂Se₄ systems were investigated using physicochemical analysis methods (DTA, XRD, measurements of microhardness and density), and their phase diagrams were constructed.

Conclusions: It has been established that the specified systems are quasi-binary and are characterized by the formation of continuous substitution-type solid-solution areas. The solid solutions Pb_1-xSm_xGa₂S₄ and Pb_1-xSm_xGa₂Se₄ crystallize in the orthorhombic crystal system and belong to the EuGa2S4 structural type. Their unit-cell parameters vary within the following ranges: Pb_1-xSm_xGa₂S₄ a = 20.745–20.706 Å; b = 20.464–20.380 Å; c = 12.236–12.156 Å; Pb1-xSmxGa2Se4 a = 21.722–21.782 Å; b = 21.202–21.350 Å; c = 12.3047–12.390 Å; Space group: Fddd, Z = 32. Several physicochemical properties of the Pb_1-xSm_xGa₂S₄ and Pb_1-xSm_xGa₂Se₄ solid solutions have been investigated.

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Author Biographies

Ozbek M. Aliev, Institute of Catalysis and Inorganic Chemistry, 113 H. Javid ave., Baku AZ-1143, Azerbaijan

Dr. Sci. (Chem.), Professor, Institute of Catalysis and Inorganic Chemistry (Baku, Azerbaijan)

Dilbar S. Azhdarova, Institute of Catalysis and Inorganic Chemistry, 113 H. Javid ave., Baku AZ-1143, Azerbaijan

Dr. Sci. (Chem.), Associate Professor, Institute of Catalysis and Inorganic Chemistry (Baku, Azerbaijan)

Reyhan M. Agayeva, Azerbaijan State Pedagogical University, 68 U. Hajibeyli st., Baku AZ-1000, Azerbaijan

PhD (in Chem.), Associate Professor, Azerbaijan State Pedagogical University (Baku, Azerbaijan)

Valida M. Raqimova, Institute of Catalysis and Inorganic Chemistry, 113 H. Javid ave., Baku AZ-1143, Azerbaijan

PhD (in Chem.), Associate Professor, Leading Researcher, Institute of Catalysis and Inorganic Chemistry (Baku, Azerbaijan)

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