Phase relations and thermoelectric properties of alloys in the Bi₂Te₃-Bi₂Se₃ system

Author： Sokolov O. Skipidarov S. Duvankov N. Shabunina G.

ISSN： 0020-1685

Source： Inorganic Materials, Vol.43, Iss.1, 2007-01, pp. : 8-11

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Abstract

Using differential thermal analysis and x-ray diffraction, we have shown that the Bi₂Te₃-Bi₂Se₃ system contains a continuous series of solid solutions in a narrow temperature range and a compound of composition Bi₂Te₂Se below the solidus line. The liquidus and solidus lines determined using zone-melted samples differ little from those reported in the literature for equilibrium samples. The Bi₂Te_3−xSe_x solid-solution phase extends to ∼-14 mol % Bi₂Se₃ (Bi₂Te_2.58Se_0.42). The thermoelectric power of the alloys drops sharply near the boundary of the two-phase region. Within the homogeneity range of Bi₂Te₂Se (33.3 mol % Bi₂Se₃), the thermoelectric power factor has a minimum, while the thermoelectric power has a small maximum.