Filep M. Systems based on Tl(I), Sn(II), Pb(II) chalcogenides: interaction of components and properties of the phases

The dissertation contain the results of the investigation of the phase equilibria in quasiternary and ternary reciprocal systems based on chalcogenides of Tl(I), Sn(II), Pb(II). At the first time the phase equilibria on 15 quasibinary and 10 quasiternary polithermal sections of quasiternary systems Tl2X-SnX-PbX and ternary reciprocal systems Tl2X+Sn(Pb)X'=Tl2X'+Sn(Pb)X (де X,X'-S,Se,Te) was investigated. The tendencies of changes of interaction in systems based on chalcogenides of Tl(I), Sn(II) and Pb(II) based on diagrams of St. Jonh-Bloch was established. ). At the first time the TGH on single crystals of Tl4SnS3, Tl4PbТе3 and SGH on single crystals of Tl4SnSе3, Tl4Pb(Se3)Те3 and a photoinduced dilatometric measurement for Tl4SnSе3 single crystals was investigated. At the first time the temperature dependencies of conductivity,the Seebeck coefficient and thermoelectric power for polycrystals of compounds Tl4SnSе3, Tl4PbSe3 and solid solution (Tl4SnSe3)60(Tl4PbSe3)40.