Title :
Comparison of the thermoelectric properties of (Bi,Sb)2Te3 alloys prepared by powder metallurgy with single crystals
Author :
Kim, Hang-Chong ; Lee, Jun-Soo ; Oh, Tae-Sung ; Hyun, Dow-Bin ; Kolomoets, N.V.
Author_Institution :
Dept. of Metall. Eng. & Mater. Sci., Hong Ik Univ., Seoul, South Korea
Abstract :
Thermoelectric properties of the polycrystalline (Bi1-xSbx)2Te3 (0⩽x⩽1) alloys, prepared by various powder metallurgy such as mechanical alloying and melting/grinding, were measured and compared with the characteristics of single crystals. Contrary to the p-type behavior of the single crystals in all compositions of 0⩽x⩽1, a p-n transition occurred at about 0.67 mol% Sb2Te3 for the alloys prepared by powder metallurgy. Among the p-type (Bi1-xSbx)2Te3 (x⩾0.7) processed by powder metallurgy, (Bi0.2Sb0.8)2 Te3 exhibited the highest figure-of-merit of 3.05×10-3/K. Thermoelectric properties of the hot-pressed (Bi0.2Sb0.8)2Te3 with addition of BN powders as scattering centers were also investigated
Keywords :
antimony compounds; bismuth compounds; hot pressing; mechanical alloying; powder metallurgy; semiconductor materials; thermoelectricity; (Bi,Sb)2Te3 alloys; (BiSb)2Te3; BN powders; figure-of-merit; grinding; hot-pressed (Bi0.2Sb0.8)2Te3; mechanical alloying; melting; p-n transition; p-type behavior; polycrystalline alloys; powder metallurgy; scattering centers; single crystals; thermoelectric properties; Alloying; Bismuth; Crystals; Mechanical factors; Mechanical variables measurement; Powders; Scattering; Tellurium; Thermoelectricity; Tin alloys;
Conference_Titel :
Thermoelectrics, 1998. Proceedings ICT 98. XVII International Conference on
Conference_Location :
Nagoya
Print_ISBN :
0-7803-4907-5
DOI :
10.1109/ICT.1998.740333
