INFLUENCE OF EXTRUSION TEMPERATURE ON THE FORMATION OF P–TYPE CONDUCTIVITY BI0.5SB1.5TE3 STRUCTURE

This article deals with regularities of defect structure and texture formation for extrusion of thermoelectric materials at different temperatures. The authors consider the influence of competition between deformation processes, return and recrystallization on the structure and properties of extruded materials. The experiment uses X–ray diffraction method, Harman’s method and the method of hydrostatic weighing for thermoelectric samples at different extrusion temperatures. The texture, physical properties and density of thermo electric materials change nonmonotonically depending on the extrusion temperature. The research allows establishing optimum extrusion temperature for thermoelectric materials achieving the greatest thermoelectric figure of merit. The research shows that the thermoelectric material has the best properties after extrusion at 400 °C.