Phase equilibria in the GeTe-Sb2Te3-Te system

Elnur R. Nabiyev; Elnur N. Orujlu; Alekper A. Hasanov; Aytan I. Aghazade; Sevda H. Aliyeva; Yusif A. Yusibov

doi:10.17308/kcmf.2025.27/13322

Elnur R. Nabiyev Ganja State University, 429 H. Aliyev ave., Ganja AZ-2001, Azerbaijan https://orcid.org/0009-0006-1907-3957
Elnur N. Orujlu Azerbaijan State Oil and Industry University, 16/21 Azadlıq ave., Baku AZ-1010, Azerbaijan https://orcid.org/0000-0001-8955-7910
Alekper A. Hasanov Azerbaijan State Oil and Industry University, 16/21 Azadlıq ave., Baku AZ-1010, Azerbaijan
Aytan I. Aghazade Institute of Catalysis and Inorganic Chemistry, 113 H. Javid ave., Baku AZ-1143, Azerbaijan https://orcid.org/0000-0002-6072-1075
Sevda H. Aliyeva Nakhchivan State University, 1 H. Aliyev ave., Nakhchivan AZ-7000, Azerbaijan https://orcid.org/0009-0007-7737-0578
Yusif A. Yusibov Ganja State University, 429 H. Aliyev ave., Ganja AZ-2001, Azerbaijan https://orcid.org/0000-0003-4081-6170

DOI: https://doi.org/10.17308/kcmf.2025.27/13322

Keywords: Layered germanium-antimony tellurides, Phase memory materials, Topological insulator, Phase diagram

Abstract

Objectives: Germanium-antimony tellurides are of considerable practical interest as thermoelectrics with low thermal conductivity, topological insulators and phase memory materials. In this paper, the results of a study of phase equilibria in the region of GeTe-Sb₂Te₃-Te compositions of the Ge-Sb-Te system using the DTA, X-ray diffraction and SEM methods are we presents.

Experimental: The studied samples were synthesized using a special technique that allows them to be obtained in a state as close to equilibrium as possible.

Conclusions: A diagram of solid-phase equilibria at 300 K, a projection of the liquidus surface and some polythermal sections of the phase diagram are constructed. The fields of primary crystallization of phases are outlined, non- and monovariant equilibria are determined. According to the obtained picture of phase equilibria, the curves of monovariant equilibria originating from the peritectic and eutectic points of the boundary system GeTe-Sb₂Te₃ undergo transformations at certain transition points. In the region of compositions rich in tellurium, a number of invariant transition reactions occur, corresponding to the joint crystallization of two-phase mixtures of telluride phases and elemental tellurium.

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Author Biographies

Elnur R. Nabiyev, Ganja State University, 429 H. Aliyev ave., Ganja AZ-2001, Azerbaijan

PhD student, Ganja State University (Ganja, Azerbaijan)

Elnur N. Orujlu, Azerbaijan State Oil and Industry University, 16/21 Azadlıq ave., Baku AZ-1010, Azerbaijan

PhD in Chemistry, Head of “Nanomaterials and Nanotechnologies” Science-Research Laboratory, Azerbajan State Oil and Industry University (Baku, Azerbaijan)

Alekper A. Hasanov, Azerbaijan State Oil and Industry University, 16/21 Azadlıq ave., Baku AZ-1010, Azerbaijan

Dr. Sci. (Tech.), Professor, Azerbajan State Oil and Industry University (Baku, Azerbaijan)

Aytan I. Aghazade, Institute of Catalysis and Inorganic Chemistry, 113 H. Javid ave., Baku AZ-1143, Azerbaijan

PhD student, Researcher at the Institute of Catalysis and Inorganic Chemistry (Baku, Azerbaijan)

Sevda H. Aliyeva, Nakhchivan State University, 1 H. Aliyev ave., Nakhchivan AZ-7000, Azerbaijan

PhD student, Nakhchivan State University (Nakhchivan, Azerbaijan)

Yusif A. Yusibov, Ganja State University, 429 H. Aliyev ave., Ganja AZ-2001, Azerbaijan

Dr. Sci. (Chem.), Professor, Rector of the Ganja State University (Ganja, Azerbaijan)

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