The Effect of Grain Size and Density on the Thermoelectric Properties of Bi2Te3-PbTe Compounds

Title
The Effect of Grain Size and Density on the Thermoelectric Properties of Bi2Te3-PbTe Compounds
Authors
윤세진권오정안승현김재열구현배성환조준영김진상박찬
Keywords
Thermoelectric material; microstructure; Bi2Te3-PbTe binary; density; grain boundary
Issue Date
2013-12
Publisher
Journal of electronic materials
Citation
VOL 42, NO 12, 3390-3396
Abstract
The effects of microstructure on thermoelectric properties were investigated in Bi2Te3-PbTe compounds of different grain size and density. Powders of two different sizes [0.1 μm to 1 μm (micropowder) and <50 nm (nanopowder)] were prepared from Bi2Te3-PbTe ingots by ball milling and high-energy ball milling. Three different samples were spark plasma sintered from each powder and the mixture of the two powders. The grain size and relative density of the sintered samples varied from 100 nm to a few micrometers and 89.7% to 97.3%, respectively. The dimensionless figure of merit zT of the sample sintered from nanopowder was about 0.50 at 500 K, being about 3.3 times larger than that of the sample sintered from micropowder (~0.15 at 500 K), when the relative density of the former and the latter were 89.7% and 97.3%, respectively. The improved thermoelectric performance of the samples may originate from the decrease of the thermal conductivity, which was caused by the decrease of the grain size and the increase of the amount of pores.
URI
http://pubs.kist.re.kr/handle/201004/46919
ISSN
03615235
Appears in Collections:
KIST Publication > Article
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE