|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Alloys and Compounds for Thermoelectric and Solar Cell Applications VI
||Enhancement of Thermoelectric Performance Through Optimization of Hot-pressing Parameters in the Gas Atomized Bi0.5Sb1.5Te3 Alloys
||Peyala Dharmaiah, D.W Shin, M Babu, C.H. Lee, Soon-Jik Hong
|On-Site Speaker (Planned)
The performance of a typical thermoelectric material is still below unity which leads the cost of the device was high. Recently, considerable attention has been paid to reduce the production cost and reliability of the performance. We tried to investigate the fundamental transport parameters (Seebeck coefficient, electrical conductivity, carrier concentration, mobility, effective mass, thermal conductivity, and quality factor) with different hot pressing temperatures and holding times by the help of single parabolic band model (SPB) for improved thermoelectric performance of Bi0.5Sb1.5Te3. The grain size variations and microstructural features could be clearly investigated using SEM and EBSD techniques. The results indicate that the Seebeck coefficient significantly increased and less decline of electrical conductivity for 120 min holding time at 470oC bulk samples due to the decreased carrier concentration and increased mobility. Simultaneously, the thermal conductivity (κ) decreased substantially (55%) owing to enhanced phonon scattering by tellurium precipitates.
||Planned: Supplemental Proceedings volume