Kozma A. Interaction of components and properties of phases in the quasiternary system Tl2Se-SnSe2-Bi2Se3

In work are presented the results of the phase equilibria investigations in the quasiternary system Tl2Se-SnSe2-Bi2Se3. Four quasibinary (SnSe2-TlBiSe2, Tl2SnSe3-TlBiSe2, Tl4SnSe4-TlBiSe2, Tl4SnSe4-Tl9BiSe6), two polythermic (Tl0.5Sn0.5Bi0.5Se2-Bi2Se3, Tl2Sn2Se5-TlBiSe2), six (SnSe2-TlBiSe2-Bi2Se3, SnSe2-Tl2Sn2Se5-TlBiSe2, Tl2Sn2Se5-Tl2SnSe3-TlBiSe2, Tl2SnSe3-Tl4SnSe4-TlBiSe2, Tl4SnSe4-Tl9BiSe6-TlBiSe2, Tl4SnSe4-Tl2Se-Tl9BiSe6) three dimensional phase diagrams, the liquidus projection and isothermal section of the Tl2Se-SnSe2-Bi2Se3 were constructed, at first. The polycrystalline samples have been obtained for the intermediate phases of the system; and the thermoelectric properties of the samples have been examined. The polycrystalline samples Tl9BiSe6, (Tl9BiSe6)0.995(Tl4SnSe4)0.005, (SnSe2)0.55(TlBiSe2)0.45, (Tl2Se)0.899(Bi2Se3)0.101, (Tl4SnSe4)0.76(Tl9BiSe6)0.13(TlBiSe2)0.11 and (Tl4SnSe4)0.85(Tl9BiSe6)0.15 have been recommended for use in the thermoelectric devices due to their competitiveness.