Calorimetric determination of phase transitions of Ag8ВX6 (B = Ge, Sn; X = S, Se) compounds

Ulviya R. Bayramova; Albina N. Poladova; Leyla F. Mashadiyeva; Mahammad B. Babanly

doi:10.17308/kcmf.2022.24/9258

Ulviya R. Bayramova M. Nagiev Institute of Catalysis and Inorganic Chemistry of the Azerbaijan National Academy of Sciences, 113, H. Javid pr., Baku Az1143, Azerbaijan https://orcid.org/0000-0001-5096-2513
Albina N. Poladova M. Nagiev Institute of Catalysis and Inorganic Chemistry of the Azerbaijan National Academy of Sciences, 113, H. Javid pr., Baku Az1143, Azerbaijan https://orcid.org/0000-0001-9653-6675
Leyla F. Mashadiyeva M. Nagiev Institute of Catalysis and Inorganic Chemistry of the Azerbaijan National Academy of Sciences, 113, H. Javid pr., Baku Az1143, Azerbaijan https://orcid.org/0000-0003-2357-6195
Mahammad B. Babanly M. Nagiev Institute of Catalysis and Inorganic Chemistry of the Azerbaijan National Academy of Sciences, 113, H. Javid pr., Baku Az1143, Azerbaijan https://orcid.org/0000-0001-5962-3710

DOI: https://doi.org/10.17308/kcmf.2022.24/9258

Keywords: Ag8GeS6, Ag8GeSe6, Ag8SnS6, Ag8SnSe6, phase transition, thermodynamic functions, enthalpy, entropy, differential scanning calorimetry

Abstract

Differential scanning calorimetry (DSC) was used to study ternary Ag₈GeS₆, Ag₈GeSe₆, Ag₈SnS₆, and Ag8SnSe6 compounds which undergo polymorphic transformations at relatively low temperatures. Two samples of each compound with different masses in the range of 20-40 mg were examined and three DSC heating curves were taken for each sample. The DSC curve data were used to determine the temperatures and enthalpies of the phase transitions of the studied compounds from a low-temperature rhombic modification to a high-temperature cubic modification. The difference in the DSC data between all samples and all heating curves did not exceed 2%. The obtained data were used to calculate the entropies of phase
transitions. It was shown that these values are abnormally high. The study also involved a comparative analysis of the obtained thermodynamic data for the Ag₈GeSe₆ and Ag₈SnSe₆ compounds and the results obtained by the method of electromotive forces.

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Author Biographies

Ulviya R. Bayramova, M. Nagiev Institute of Catalysis and Inorganic Chemistry of the Azerbaijan National Academy of Sciences, 113, H. Javid pr., Baku Az1143, Azerbaijan

PhD student

Albina N. Poladova, M. Nagiev Institute of Catalysis and Inorganic Chemistry of the Azerbaijan National Academy of Sciences, 113, H. Javid pr., Baku Az1143, Azerbaijan

Junior Scientific Fellow

Leyla F. Mashadiyeva, M. Nagiev Institute of Catalysis and Inorganic Chemistry of the Azerbaijan National Academy of Sciences, 113, H. Javid pr., Baku Az1143, Azerbaijan

Ph.D. (Chem.), Accociate
Professor, Senior Scientific Fellow

Mahammad B. Babanly, M. Nagiev Institute of Catalysis and Inorganic Chemistry of the Azerbaijan National Academy of Sciences, 113, H. Javid pr., Baku Az1143, Azerbaijan

Dr. Sci. (Chem.), Professor,
Associate Member of the Azerbaijan National Academy
of Sciences, Executive Director of the Institute of
Catalysis and Inorganic Chemistry, Azerbaijan

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