Table of Contents Author Guidelines Submit a Manuscript
Journal of Nanomaterials
Volume 2013, Article ID 905389, 5 pages
http://dx.doi.org/10.1155/2013/905389
Research Article

Formation of Dense Pore Structure by Te Addition in Bi0.5Sb1.5Te3: An Approach to Minimize Lattice Thermal Conductivity

1Department of Energy Science, Sungkyunkwan University, Suwon, Gyeonggi 440-746, Republic of Korea
2Materials R&D Center, Samsung Advanced Institute of Technology, Samsung Electronics, Yongin, Gyeonggi 446-712, Republic of Korea
3Powder Technology Department, Powder and Ceramics Division, Korea Institute of Materials Science, Changwon, Gyeongnam 642-831, Republic of Korea
4School of Energy, Materials and Chemical Engineering, Korea University of Technology and Education, Cheonan, Chungnam 330-708, Republic of Korea
5Centre for Integrated Nanostructure Physics, Institute of Basic Science (IBS), Daejeon 305-701, Republic of Korea

Received 14 June 2013; Accepted 20 September 2013

Academic Editor: Won-Seon Seo

Copyright © 2013 Syed Waqar Hasan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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 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.