Formation of dense pore structure by te addition in Bi0.5Sb 1.5Te3: An approach to minimize lattice thermal conductivity

Syed Waqar Hasan, Hyeona Mun, Sang Il Kim, Jung Young Cho, Jong Wook Roh, Sangsun Yang, Soon Mok Choi, Kyu Hyoung Lee, Sung Wng Kim

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5 Citations (Scopus)

Abstract

We herein report the electronic and thermal transport properties of p-type Bi0.5Sb1.5Te3 polycrystalline bulks with dense pore structure. Dense pore structure was fabricated by vaporization of residual Te during the pressureless annealing of spark plasma sintered bulks of Te coated Bi0.5Sb1.5Te3 powders. The lattice thermal conductivity was effectively reduced to the value of 0.35 W m-1 K-1 at 300 K mainly due to the phonon scattering by pores, while the power factor was not significantly affected. An enhanced ZT of 1.24 at 300 K was obtained in spark plasma sintered and annealed bulks of 3 wt.% Te coated Bi0.5Sb1.5Te3 by these synergetic effects.

Original languageEnglish
Article number905389
JournalJournal of Nanomaterials
Volume2013
DOIs
Publication statusPublished - 2013

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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