A refined phase diagram of the GeTe-Bi2Te3 system

  • Turkan M. Alakbarova Azerbaijan State Oil and Industry University, 16/21 Azadlıq ave., Baku AZ-1010, Azerbaijan; Section for Solid State and Theoretical Inorganic Chemistry, Institute of Inorganic Chemistry, University of Tübingen, D-72076, Tübingen, Germany https://orcid.org/0000-0003-4913-4520
  • Hans-Jürgen Meyer Section for Solid State and Theoretical Inorganic Chemistry, Institute of Inorganic Chemistry, University of Tübingen, D-72076, Tübingen, Germany https://orcid.org/0000-0003-2450-4011
  • Elnur N. Orujlu Institute of Catalysis and Inorganic Chemistry after M.Nagiev of the Azerbaijan National Academy of Sciences, 113, H. Javid ave., Baku, Az1143, Azerbaijan https://orcid.org/0000-0001-8955-7910
  • Mahammad B. Babanly Institute of Catalysis and Inorganic Chemistry after M.Nagiev of the Azerbaijan National Academy of Sciences, 113, H. Javid ave., Baku, Az1143, Azerbaijan https://orcid.org/0000-0001-5962-3710
Keywords: Germanium-bismuth tellurides, Phase diagram, Layered tetradymite-like structures, Solid solutions

Abstract

        Updated phase diagram of the GeTe–Bi2Te3 system was constructed using differential thermal, X-ray diffraction analysis and scanning electron microscopy (SEM) results of alloys synthesized with specially developed technology. The refined version significantly differs from those reported so far. The presented phase diagram reflects six ternary compounds: Ge4Bi2Te7, Ge3Bi2Te6, Ge2Bi2Te5, GeBi2Te4, GeBi4Te7, and GeBi6Te10.
         The study determined that the first two compounds are formed as a result of solid-state reactions at temperatures of 750–800 K, and the latter four are formed as a result of peritectic reactions at 863, 854, 848, and 843 K, respectively. Wide homogeneity regions based on the initial binary compounds were also found. These regions reach 10 mol% at room temperature. The coordinates of eutectic point are 83 mol% Bi2Te3 and 838 K. It crystallises at 838 К. It was found that all the identified ternary compounds crystallise in a tetradymite-like layered structure. Ge4Bi2Te7, Ge3Bi2Te6, Ge2Bi2Te5, and GeBi2Te4 compounds belong to the nGeTe·Bi2Te3 homologous series. Their crystal lattices are formed by the insertion of GeTe bilayers into the quintuple Bi2Te3 layers. GeBi4Te7 and GeBi6Te10 compounds are representatives of the GeTe·mBi2Te3
homologous series and have a mixed-layer structure. The parameters of the crystal lattices of the compounds were determined by the Rietveld method based on their powder diffraction data. 

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Author Biographies

Turkan M. Alakbarova, Azerbaijan State Oil and Industry University, 16/21 Azadlıq ave., Baku AZ-1010, Azerbaijan; Section for Solid State and Theoretical Inorganic Chemistry, Institute of Inorganic Chemistry, University of Tübingen, D-72076, Tübingen, Germany

Postdoctoral student, Azerbaijan State Oil and Industry University (Baku, Azerbaijan).

Hans-Jürgen Meyer, Section for Solid State and Theoretical Inorganic Chemistry, Institute of Inorganic Chemistry, University of Tübingen, D-72076, Tübingen, Germany

Professor, Section for Solid State and Theoretical Inorganic Chemistry, Institute of Inorganic Chemistry, University of Tübingen (Tübingen, Germany).

Elnur N. Orujlu, Institute of Catalysis and Inorganic Chemistry after M.Nagiev of the Azerbaijan National Academy of Sciences, 113, H. Javid ave., Baku, Az1143, Azerbaijan

Postdoctoral Student, Research Fellow, Institute of Catalysis and Inorganic Chemistry, Azerbaijan National Academy of Sciences (Baku, Azerbaijan).

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

DSc in Chemistry, Professor, Associate Member of the Azerbaijan National Academy of Sciences, Deputy-director of the Institute of Catalysis and Inorganic Chemistry, Azerbaijan National Academy of Sciences, Baku State University (Baku, Azerbaijan).

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Published
2022-03-15
How to Cite
Alakbarova, T. M., Meyer, H.-J., Orujlu, E. N., & Babanly, M. B. (2022). A refined phase diagram of the GeTe-Bi2Te3 system. Kondensirovannye Sredy I Mezhfaznye Granitsy = Condensed Matter and Interphases, 24(1), 11-18. https://doi.org/10.17308/kcmf.2022.24/9050
Section
Original articles