Abstract
Phase equilibria in the Tl5Te3-Tl9SbTe6-Tl9GdTe6 system were experimentally studied by thermal analysis, X-ray diffraction and microhardness measurements applied to equilibrated alloys. Some isopleth sections, isothermal section at 760 K, and also projections of the liquidus and solidus surfaces, were constructed. A continuous series of solid solutions was found in this system. Solid solutions crystallize in the tetragonal Tl5Te3 structure type.
Highlights
A number of works have illustrated the continuing interests in new multinary chalcogenides of heavy p-elements, including rare earth elements
This study reports a detailed investigation of phase equilibria in the Tl5Te3-Tl9SbTe6-Tl9GdTe6 system
X-ray powder diffraction (XRD), differential thermal analysis (DTA) and microhardness measurements were employed to check the purity of the synthesized starting compounds and analyze the samples in order to plot the phase diagrams
Summary
A number of works have illustrated the continuing interests in new multinary chalcogenides of heavy p-elements, including rare earth elements. Due to their important functional properties, they find applications in a wide range of devices such as ion-selective sensors, microbatteries, modern day solar cells, and thermoelectric energy conversion.[1,2,3] ; some of them have attracted interest as topological insulators.[4,5]. Tl5Te3, thanks to features of crystal structure (Sp.gr.I4/mcm, a = 8.930; c = 12.598 Å) has a number of ternary derivatives of Tl4AIVTe3 and Tl9BVTe6-type (AIV-Sn, Pb; BV-Sb, Bi).[6,7,8,9] These compounds exhibit good thermoelectric properties, and Tl9BiTe6 has reported a ZT ∼1.2 at 500 K.10–12.
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