METHOD OF PRODUCING n-TYPE THERMOELECTRIC MATERIAL BASED ON SOLID SOLUTIONS OF BiTe-BiSe Russian patent published in 2014 - IPC H01L35/34 

FIELD: chemistry.

SUBSTANCE: rods of thermoelectric material based on solid solutions of Bi₂Te₃-Bi₂Se with n-type conductivity, effectiveness ZT>1.2 and mechanical strength of not less than 150 MPa are made through mechanical activation synthesis of a ternary solid solution of Bi₂Te_2.85Se_0.15 with n-type conductivity from starting components. The donor alloy used is Bi₁₁Sei₂Cl₉. The obtained material then undergoes preliminary cold pressing into a briquette and hot extrusion under pressure through a draw plate in two steps. First, the briquette enters the conical part of the draw plate at pressure of 250-350 MPa, where it undergoes plastic deformation at temperature of 350-420°C with elongation ratio of 8-11. At the same pressure, the formed rod enters the equal channel part of the draw plate, where it undergoes further plastic deformation by equal channel multi-angular pressing with deformation ratio ε<1 at temperature which is 50-70°C higher than temperature in the conical part of the draw plate. The thermoelectric rod then undergoes post-extrusion annealing at temperature of 300-350°C for 1-5 days.

EFFECT: improved method.

2 cl, 2 tbl, 1 dwg