Abstract
Phase equilibria in the section Tl4PbTe3-Tl9SmTe6-Tl9BiTe6 of the Tl-Pb-Bi-Sm-Te system were determined by combination of differential thermal analysis, powder X-ray diffraction methods as well as microhardness measurements. The phase diagrams of the boundary systems Tl4PbTe3-Tl9SmTe6, Tl9SmTe6-Tl9BiTe6, isothermal section at 820 and 840 K, some isopleth sections and as well as liquidus and solidus surfaces projections, were plotted. Unlimited solid solutions, which crystallize in Tl5Te3 structure type were found in the system at the solidus temperatures and below.
Highlights
Tl5Te3 compound crystallizes in tetragonal structure (Sp.gr.I4/mcm, a = 8.930; c = 12.598 Å), 10,11 and has a number of ternary substitutional analogs of Tl4AIVTe3 and Tl9BVTe6 -type (AIV-Sn, Pb; BV-Sb, Bi),[12,13,14] which possess a good thermoelectric performance.[15,16]
The formation of unlimited solid solutions was shown for these systems
The resulting ingots were homogeneous polycrystals alloys that were established by the differential thermal analysis (DTA) and X-ray diffraction (XRD)
Summary
Complex chalcogenides based materials of great interest for many years due to their functional properties such as optic, photoelectric, magnet, thermoelectric et al.[1,2,3] Some of these materials exhibit properties of topological insulators and can use in spintronic devices.[4,5,6] a number of papers present the results of the study of interactions of the rare-earth elements with heavy elements chalcogenides.[7,8,9]. Kleinke and co-workers 20–22 confirmed the results of the studies,[18,19] and determined the thermoelectric and magnetic properties for a number Tl9LnTe6-type compounds. We presented the results of a study of phase relations for a number of systems including the Tl5Te3 compound or its structural analogs.[23,24,25] The formation of unlimited solid solutions was shown for these systems. We continue to study similar systems and present the experimental results on phase equilibria in the Tl4PbTe3-Tl9SmTe6-Tl9BiTe6 section of the Tl-Pb-BiSm-Te system. The alloys of the Tl4PbTe3-Tl9SmTe6-Tl9BiTe6 system were prepared by melting of previously synthesized ternary compounds. The total mass of each ingot is about 1 g
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