GeTe–Bi2Te3–Te System

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Abstract

Alloys of the GeTe–Bi2Te3–Te system, synthesized using a special technique that makes it possible to obtain them in a state as close as possible to equilibrium, have been studied using the methods of differential thermal and X-Ray diffraction analysis, as well as scanning electron microscopy. A solid-phase equilibria diagram, a projection of the liquidus surface, some polythermal sections and an isothermal section at 300 K of the phase diagram were constructed. The fields of primary crystallization of phases, types and coordinates of non— and monovariant equilibria are determined. It has been established that monovariant equilibria on curves emanating from the peritectic and eutectic points of the GeTe–Bi2Te3 boundary system undergo transformations at certain transition points. Near the tellurium corner of the concentration triangle, a cascade of invariant transition reactions has been identified, characterizing the joint crystallization of two-phase mixtures of telluride phases and elemental tellurium.

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About the authors

E. N. Orujlu

Azerbaijan State Oil and Industry University

Author for correspondence.
Email: babanlymb@gmail.com
Azerbaijan, Baku

T. M. Alakbarova

Baku State University

Email: babanlymb@gmail.com
Azerbaijan, Baku

M. B. Babanly

Baku State University; Institute of Catalysis and Inorganic Chemistry; Azerbaijan State University of Economics

Email: babanlymb@gmail.com
Azerbaijan, Baku; Baku; Baku

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Supplementary files

Supplementary Files
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2. Fig. 1. Phase diagram of the GeTe–Bi2Te3 system [46]. In the upper right corner there is a T-x diagram based on the data [32]

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3. Fig. 2. Studied sections and alloy compositions

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4. Fig. 3. Diagram of solid–phase equilibria in the GeTe-Bi2Te3–Te system

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5. Fig. 4. Powder diffractograms of alloys shown in Fig. 3

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6. Fig. 5. SEM images of some alloys shown in Fig. 3

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7. Fig. 6. The surface of the liquidus of the GeTe–Bi2Te3–Te system. Primary crystallization fields: 1 — a1 (a2); 2 — β; 3 — Ge2Bi2Te5; 4 — GeBi2Te4; 5 — GeBi4Te7; 6 — GeBi6Te10; 7 — Te

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8. Fig. 7. Ge2Bi2Te5–Te polythermal section of the GeTe–Bi2Te3–Te phase diagram

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9. Fig. 8. The GeBi2Te4–Te polythermal section of the GeTe–Bi2Te3–Te phase diagram

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10. Fig. 9. The GeBi4Te7–Te polythermal section of the GeTe–Bi2Te3–Te phase diagram

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11. Fig. 10. The GeBi6Te10–Te polythermal section of the GeTe–Bi2Te3–Te phase diagram

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12. Fig. 11. Polythermal section of the GeTe–[B] phase diagram of the GeTe–Bi2Te3–Te system

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13. Fig. 12. Polythermal section Bi2Te3–[A] of the phase diagram of the GeTe–Bi2Te3–Te system

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