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Title: Effect of ceramic dispersion on thermoelectric properties of nano-ZrO{sub 2}/CoSb{sub 3} composites

Abstract

In the present work, nano-ZrO{sub 2}/CoSb{sub 3} composites were fabricated by milling ZrO{sub 2} and CoSb{sub 3} powders and hot pressing at different sintering temperatures. For the prepared compacts, the phase purity, microstructure, and temperature-dependent thermoelectric properties were characterized. The effect of nano-ZrO{sub 2} dispersion on composite electrical conductivity and thermal conductivity is strictly clarified by comparing the transport properties of the nondispersed and dispersed CoSb{sub 3} at identical porosity, so that the effect of porosity on thermoelectric parameters could be eliminated. The effect of the insulating inclusion itself on transport properties is also considered and eliminated using effective media theories. It is clearly verified that charge carrier scattering and phonon scattering occur simultaneously to lower the electrical conductivity and the thermal conductivity of CoSb{sub 3} due to the introduction of nano-ZrO{sub 2} inclusions. The investigated composites show higher electrical conductivity due to existence of metallic Sb and lower thermal conductivity because of nanodispersion. At the ranges of high measuring temperature (673-723 K) and low porosity (6%-9%), the ratio of electrical conductivity to thermal conductivity of the dispersed CoSb{sub 3} is higher than that of nondispersed CoSb{sub 3}, and the dimensionless figure of merit (ZT) of the composite could probablymore » be improved at these ranges with the enhanced ratio of electrical conductivity to thermal conductivity and Seebeck coefficient, which is assumed to be increased by a potential barrier scattering.« less

Authors:
; ; ; ; ; ; ;  [1];  [2]
  1. Institute of Materials Research, German Aerospace Center (DLR), D-51170 Cologne (Germany)
  2. (KTH), SE-10044 Stockholm (Sweden)
Publication Date:
OSTI Identifier:
20982705
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 101; Journal Issue: 4; Other Information: DOI: 10.1063/1.2561628; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANTIMONY ALLOYS; CERAMICS; CHARGE CARRIERS; CHARGED-PARTICLE TRANSPORT; COBALT ALLOYS; COMPOSITE MATERIALS; ELECTRIC CONDUCTIVITY; HOT PRESSING; MICROSTRUCTURE; MILLING; NANOSTRUCTURES; POROSITY; POWDERS; SEEBECK EFFECT; SINTERING; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0400-1000 K; THERMAL CONDUCTIVITY; THERMOELECTRIC PROPERTIES; ZIRCONIUM OXIDES

Citation Formats

He, Zeming, Stiewe, Christian, Platzek, Dieter, Karpinski, Gabriele, Mueller, Eckhard, Li, Shanghua, Toprak, Muhammet, Muhammed, Mamoun, and Materials Chemistry Division, Royal Institute of Technology. Effect of ceramic dispersion on thermoelectric properties of nano-ZrO{sub 2}/CoSb{sub 3} composites. United States: N. p., 2007. Web. doi:10.1063/1.2561628.
He, Zeming, Stiewe, Christian, Platzek, Dieter, Karpinski, Gabriele, Mueller, Eckhard, Li, Shanghua, Toprak, Muhammet, Muhammed, Mamoun, & Materials Chemistry Division, Royal Institute of Technology. Effect of ceramic dispersion on thermoelectric properties of nano-ZrO{sub 2}/CoSb{sub 3} composites. United States. doi:10.1063/1.2561628.
He, Zeming, Stiewe, Christian, Platzek, Dieter, Karpinski, Gabriele, Mueller, Eckhard, Li, Shanghua, Toprak, Muhammet, Muhammed, Mamoun, and Materials Chemistry Division, Royal Institute of Technology. Thu . "Effect of ceramic dispersion on thermoelectric properties of nano-ZrO{sub 2}/CoSb{sub 3} composites". United States. doi:10.1063/1.2561628.
@article{osti_20982705,
title = {Effect of ceramic dispersion on thermoelectric properties of nano-ZrO{sub 2}/CoSb{sub 3} composites},
author = {He, Zeming and Stiewe, Christian and Platzek, Dieter and Karpinski, Gabriele and Mueller, Eckhard and Li, Shanghua and Toprak, Muhammet and Muhammed, Mamoun and Materials Chemistry Division, Royal Institute of Technology},
abstractNote = {In the present work, nano-ZrO{sub 2}/CoSb{sub 3} composites were fabricated by milling ZrO{sub 2} and CoSb{sub 3} powders and hot pressing at different sintering temperatures. For the prepared compacts, the phase purity, microstructure, and temperature-dependent thermoelectric properties were characterized. The effect of nano-ZrO{sub 2} dispersion on composite electrical conductivity and thermal conductivity is strictly clarified by comparing the transport properties of the nondispersed and dispersed CoSb{sub 3} at identical porosity, so that the effect of porosity on thermoelectric parameters could be eliminated. The effect of the insulating inclusion itself on transport properties is also considered and eliminated using effective media theories. It is clearly verified that charge carrier scattering and phonon scattering occur simultaneously to lower the electrical conductivity and the thermal conductivity of CoSb{sub 3} due to the introduction of nano-ZrO{sub 2} inclusions. The investigated composites show higher electrical conductivity due to existence of metallic Sb and lower thermal conductivity because of nanodispersion. At the ranges of high measuring temperature (673-723 K) and low porosity (6%-9%), the ratio of electrical conductivity to thermal conductivity of the dispersed CoSb{sub 3} is higher than that of nondispersed CoSb{sub 3}, and the dimensionless figure of merit (ZT) of the composite could probably be improved at these ranges with the enhanced ratio of electrical conductivity to thermal conductivity and Seebeck coefficient, which is assumed to be increased by a potential barrier scattering.},
doi = {10.1063/1.2561628},
journal = {Journal of Applied Physics},
number = 4,
volume = 101,
place = {United States},
year = {Thu Feb 15 00:00:00 EST 2007},
month = {Thu Feb 15 00:00:00 EST 2007}
}