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Information × Registration Number 0220U100092, 0117U000380 , R & D reports Title New functional materials in the AI,III-BIV,V-Se (AI,III-TI,Cu,Ag,In,BIV,V-Sn,Pb,Sb,Bi) systems: phase diagrams, technology, properties. popup.stage_title Head Barchii Ihor Ye., Registration Date 09-01-2020 Organization State University "Uzhhorod National University" popup.description2 Phase equilibria in the Tl–Sn(Pb,Sb,Bi)–Se, Tl2Se–In2(Sb2)Se3–“P2Se4” systems were investigated for the first time, the homogeneity regions of the initial binary and intermediate ternary compounds were determined, the coordinates of nonvariant binary and ternary processes were determined. The mechanisms of formation of solid solutions based on complex selenides are investigated. The crystal-chemical analysis of the intermediate ternary and quartery compounds and the solid solutions based on them were performed; the change of the type of chemical bonds was studied, which made it possible to establish regularities of the "compound - crystalline structure - properties". The technological conditions for the synthesis and cultivation of quality mono- (individual compounds) and polycrystalline (solid solutions and eutectic compositions) samples for which thermoelectric and optical properties have been investigated have been developed for the first time. It has been shown that the TlInP2Se6, In4(P2Se6)3, Tl4P2Se6 compounds can be used as charge carriers in solar panels. The optimization of the compositions and methods of obtaining thermoelectric materials made it possible to identify the most promising models of the individual Tl9BiSe6 compound (ZТmax=(1.5÷3.3)×10-3 К-1), composite alloys based on solid solutions (Tl2Se)0.899(Ві2Se3)0.101 (ZТmax=2.4×10-3 К-1) and (Tl9BiSe6)0.995(Tl4SnSe4)0.005 (ZТmax=(1.9÷2.9)×10-3 К-1), eutectic compositions (SnSe2)0.55(TlBiSe2)0.45 (ZТmax=(1.5÷2.6)×10-3 К-1), (Tl4SnSe4)0.76(Tl9BiSe6)0.13(TlBiSe2)0.11 (ZТmax=1.9×10-3 К-1) and (Tl4SnSe4)0.85(Tl9BiSe6)0.15 (ZТmax=1.5×10-3 К-1) (6 patents of Ukraine No. 111241, 120279, 105409, 113556, 24333/ЗА/17, а201808806 received ), which are dominated by known chalcogenide thermoelectric materials based on Bi2Te3 and PbTe by maximum values of figure of merit.  Product Description popup.authors Barchiy Igor E. Malakhovska Tatjana O. Pogodin Artem I. Sidei Vasyl I. Sabov Victoria I. Sabov Marjan Yu. Filep Michail Yo. popup.nrat_date 2020-04-02 Close