Phase equilibria and thermodynamic properties of the system Tl-TlBr-Se |
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Authors: | D M Babanly Yu A Yusibov M B Babanly |
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Institution: | (1) Rasul-zade State University, Khalilov av. 23, Baku, 370148, Azerbaijan |
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Abstract: | The system Tl-Se-Br was studied in the region Tl-TlBr-Se by DTA, X-ray powder diffraction, emf measurements, and microhardness measurements. Several vertical sections, the isothermal section at 400 K, and the liquidus-surface projection were constructed. The quasi-binary sections TlBr-Tl2Se, TlBr-TlSe, Tl5Se2Br-Tl, and Tl5Se2Br-TlSe allow the system Tl-TlBr-Se to be triangulated into five subordinate triangles. Wide immiscibility regions were discovered in the system, including a three-phase region in subsystem Tl2Br-Tl2Se-Se. Homogeneity and primary separation regions were determined, as well as the types and coordinates of invariant and monovariant equilibria on the T-x-y-diagram. From the results of emf measurements, the standard thermodynamic functions of formation were calculated for the compound Tl5Se2Br. |
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