Phase equilibria of the GeTe−Bi2Te3 quasi-binary system in the range 0–50 mol% Bi2Te3

Alakbarova T., Meyer H., Orujlu E., Amiraslanov I., Babanlı M.

Phase Transitions, vol.94, no.5, pp.366-375, 2021 (SCI-Expanded, Scopus) identifier

  • Nəşrin Növü: Article / Article
  • Cild: 94 Say: 5
  • Nəşr tarixi: 2021
  • Doi nömrəsi: 10.1080/01411594.2021.1937625
  • jurnalın adı: Phase Transitions
  • Jurnalın baxıldığı indekslər: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Səhifə sayı: pp.366-375
  • Açar sözlər: GeTe-Bi2Te3 system, layered phases, morphotropic phase transitions, phase diagram, phase transitions, solid solutions
  • Açıq Arxiv Kolleksiyası: Məqalə
  • Adres: Bəli

Qısa məlumat

The GeTe-GeBi2Te4 part of the GeTe-Bi2Te3 quasi-binary system was re-examined in the 700-1000 K temperature interval by using PXRD, DTA, and SEM techniques, and the corresponding fragment of the phase diagram was constructed. The existence of 4 ternary compounds is confirmed in the system. Ge2Bi2Te5 (863 K) and GeBi2Te4 (854 K) compounds formed by peritectic reactions, while Ge3Bi2Te6 and Ge4Bi2Te7 decompose by solid-phase reactions. The system is also characterized by the formation of large areas of solid solutions based on both modifications of GeTe. Besides, rhombohedral→cubic morphotropic phase transition occurs between 9 and 10 mol% Bi2Te3 compositions. The homogeneity field of the cubic phase does not exceed 2-3 mol% at 700 K and layered phases are formed as the concentration of Bi2Te3 increases. Crystallographic parameters of ternary compounds, as well as solid solutions, were determined by the Rietveld method. A comparative analysis of obtained results with literature data is performed.