|About this Abstract
||Materials Science & Technology 2019
||Sintering and Related Powder Processing Science and Technologies
||P2-72: Formation Mechanism of Porosity in P-type Bi0.5Sb1.5Te3 Materials and its Influence on Thermoelectric Transport Properties
||Cheenepalli Nagarjuna, Pathan Sharief, Hyeon-Jeong You, Peyala Dharmaiah, Suk-Min Yoon, Soon-Jik Hong
|On-Site Speaker (Planned)
Recently, with a considerable attention on enhancement of thermoelectric performance in solid-state materials, a greater number of studies have been evolved to deteriorate the lattice thermal conductivity by intensifying the phonon scattering. In this work, we developed the formation mechanism of porosity in p-type Bi0.5Sb1.5Te3 materials and their influence on thermoelectric properties were examined. The distribution of homogeneous porosity shape and size was investigated. The results reveal that significant decrease in electrical conductivity and slightly enhanced Seebeck coefficient was observed by the increase of porosity, which is due to the appropriate variation of carrier concentration and mobility results. Moreover, thermal conductivity effectively decreased by the increase of porosity, resulting to the enhancement of phonon scattering at the interface of grain boundaries and pores. Consequently, the maximum dimensionless figure of merit, 1.26 was obtained at 400 K for the BST/PVA 0.2 wt.% composite sample, which is higher than pristine sample.
||Definite: At-meeting proceedings