|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Alloys and Compounds for Thermoelectric and Solar Cell Applications V
||Bismuth Telluride Based Compounds with High-density Current Stressing: Dopant Migration, Structural Evolution and Transport Property Modulation
||Yao-Hsiang Chen, Cheng-Tang Li, Chien-Neng Liao
|On-Site Speaker (Planned)
A large electric current can be introduced through compacted metallic or ceramic powders to enhance solid-state sintering during a hot-press process. One of the current-assisted sintering processes, known as spark plasma sintering (SPS), has been frequently used to manufacture thermoelectric materials. Although the SPS’ed thermoelectric materials demonstrated many spectacular properties, the interactions between thermoelectric materials and electric current are still not fully understood. A slight process variation may cause a huge difference in transport properties of the SPS’ed thermoelectric materials. The thermoelectric transport properties are very sensitive to charged lattice defects, micro- and nano-structures and secondary phases formed during the fabrication. In this study, we intend to investigate how a high-density electric current interacts with charged lattice defects and induces microstructural evolutions in bismuth telluride based compounds. Atomic migration of constituent elements and dopant species driven by electric current is delineated by microstructural inspection and transport property measurements.
||Planned: Supplemental Proceedings volume