Bi_2Te_3基热电材料的微观结构与电学性能_英文_.pdfVIP

第28 卷 　第2 期 材 　料 　科 　学 　与 　工 　程 　学 　报 总第124期 Vol 2 8 　No 2 J our nal of Mat erial s Science Engineering Ap r . 2 0 10 Article ID 2010) Electrical Properties and Microstructures of the Bi Te based Material s 2 3 WANG Xiaol in1 , J IANG Hongyi1 , REN Wei2 ( 1. School of Materials Science and Engineering , Wuhan University of Technology , Wuhan 430070 , China ; 2 . China Iron and Steel Researchinstitute group , Beij ing 100081 , China) 【Abstract 】　Nt yp e Bi2 ( Te0 . 975 Se0 . 025 ) 3 an d pt yp e (Bi0 . 2 Sb0 . 8 ) 2 Te3 polycry st alline t her moelect ric alloy s were p rep ared by pow der met allur gy met ho d and sp ar k p la sma sint ering at 673773 K un der 50 M Pa for 10 minut e s. The samp le s were charact erized by Xray diff ractio met ry , scanning elect ro n micro scop y , an d t he elect rical re si stivit y and Seebeck coefficient were mea sured . The eff ect s of hot p re ssing p roce ss on t he elect rical t ran sport p rop ertie s were st u died . The re sult s show t hat t he elect rical t ran sport p rop ertie s of Bi Te ba sed 2 3 mat erial s are reduced by sint erin g at 673 K and 773 K. The grain s of t he hotp re ssed alloy s are p ref erentially orient ed . The hotp re ssed alloy s are ani sot rop y in t he micro st ruct ure s and elect rical p rop ertie s.