Mechanical and Thermoelectric Properties of Bismuth Chalcogenide Solid Solutions Prepared through Melt Solidification in a Liquid
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We have studied the mechanical and thermoelectric properties of samples of n-type Bi2Te3–Bi2Se3 solid solutions containing 8 and 20 mol % Bi2Se3; doped with excess tellurium, cadmium chloride, and antimony iodide; and prepared by hot-pressing and extruding granules produced through melt solidification in a liquid. The materials have been tested in compression at 300, 423, 523, and 623 K and in bending at 300 K. Their electrical conductivity, Seebeck coefficient, and thermal conductivity have been measured in the temperature range 100–700 K. We have obtained materials with a compressive strength of ~260 MPa and maximum thermoelectric figure of merit ZT ~ 0.9 in the range 320–390 K.
Keywords:bismuth chalcogenides rapid melt solidification hot pressing extrusion compressive strength bending strength electrical conductivity thermal conductivity Seebeck coefficient thermoelectric power
This work was supported by the Russian Federation Ministry of Education and Science (state research target no. 007-00129-18-00) and the Russian Foundation for Basic Research (project no. 16-08-00033a).
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