|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Alloys and Compounds for Thermoelectric and Solar Cell Applications IV
||Development of High-performance n-type Bi2(TeSe)3 Thermoelectric Alloys by Powder Metallurgical Process
||Jing-Feng Li, Yu Pan
|On-Site Speaker (Planned)
Bismuth telluride is the best thermoelectric material for electronic cooling and power generation for low-temperature waste heat, whose property enhancement has great impact on applications. Most studies have been focused on p-type (BiSb)2Te3 to increase ZT by nanostructuring approach utilizing powder metallurgical process. However, n-type Bi2Te2.7Se0.3 processed by powder metallurgy shows lower ZT than its ingots. We fabricated a series of n-type Bi2Te3-xSex materials by spark plasma sintering (SPS) combined with mechanical alloying (MA). By investigating their electrical and thermal transport properties as a function of Se content, we found that this process generates large amounts of point defects that strongly affects carrier concentration, and hence shifts the optimal Se content to x=0.8 from x=0.3, which is conventionally recognized for ingots. Using the optimized composition, textured n-type Bi2(TeSe)3 alloys were fabricated by a repeated SPS method, leading to about 30% ZT enhancement than non-textured samples.
||Planned: A print-only volume