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Title: Low temperature transport and structural properties of misch-metal-filled skutterudites

Abstract

Skutterudites, such as CoSb{sub 3}, are a promising class of thermoelectric materials, particularly when the voids in the crystal structure are filled with guest atoms. We report a comprehensive study of the effects of filling skutterudites with misch-metal (Mm), a rare-earth alloy having the naturally occurring La, Ce, Pr, and Nd composition. Our power diffraction experiments show that Mm filling causes a larger expansion and an unusual distortion of the CoSb{sub 3} lattice compared with single-element-filled skutterudites. We probed the response of crystal lattice, electronic structure, and carrier and phonon scattering mechanisms to Mm filling using neutron powder diffraction, Hall effect, electrical resistivity, thermopower, and thermal conductivity measurements between 2 and 300 K on a series of Mm{sub y}Fe{sub 4-x}Co{sub x}Sb{sub 12} samples. The thermoelectric properties of these Mm-filled skutterudites in this low temperature range are comparable to those of pure Ce-filled skutterudites despite the anomalous lattice expansion and distortion. We expect that these materials will have high thermoelectric figures of merit at elevated temperatures.

Authors:
 [1];  [1];  [2];  [2];  [2];  [3];  [4];  [5];  [6]
  1. General Motors Corporation-R&D
  2. ORNL
  3. University of South Florida
  4. University of South Florida, Tampa
  5. Aarhus University
  6. National Institute of Standards and Technology (NIST)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); High Temperature Materials Laboratory
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
931943
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 102; Journal Issue: 083702; Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CRYSTAL LATTICES; CRYSTAL STRUCTURE; ELECTRONIC STRUCTURE; HALL EFFECT; MISCH METAL; RARE EARTH ALLOYS; THERMAL CONDUCTIVITY; THERMOELECTRIC MATERIALS; THERMOELECTRIC PROPERTIES; TRANSPORT

Citation Formats

Yang, J, Meisner, G P, Rawn, Claudia J, Wang, Hsin, Chakoumakos, Bryan C, Martin, J, Nolas, G, Pederson, B L, and Stalick, J K. Low temperature transport and structural properties of misch-metal-filled skutterudites. United States: N. p., 2007. Web. doi:10.1063/1.2794716.
Yang, J, Meisner, G P, Rawn, Claudia J, Wang, Hsin, Chakoumakos, Bryan C, Martin, J, Nolas, G, Pederson, B L, & Stalick, J K. Low temperature transport and structural properties of misch-metal-filled skutterudites. United States. doi:10.1063/1.2794716.
Yang, J, Meisner, G P, Rawn, Claudia J, Wang, Hsin, Chakoumakos, Bryan C, Martin, J, Nolas, G, Pederson, B L, and Stalick, J K. Mon . "Low temperature transport and structural properties of misch-metal-filled skutterudites". United States. doi:10.1063/1.2794716.
@article{osti_931943,
title = {Low temperature transport and structural properties of misch-metal-filled skutterudites},
author = {Yang, J and Meisner, G P and Rawn, Claudia J and Wang, Hsin and Chakoumakos, Bryan C and Martin, J and Nolas, G and Pederson, B L and Stalick, J K},
abstractNote = {Skutterudites, such as CoSb{sub 3}, are a promising class of thermoelectric materials, particularly when the voids in the crystal structure are filled with guest atoms. We report a comprehensive study of the effects of filling skutterudites with misch-metal (Mm), a rare-earth alloy having the naturally occurring La, Ce, Pr, and Nd composition. Our power diffraction experiments show that Mm filling causes a larger expansion and an unusual distortion of the CoSb{sub 3} lattice compared with single-element-filled skutterudites. We probed the response of crystal lattice, electronic structure, and carrier and phonon scattering mechanisms to Mm filling using neutron powder diffraction, Hall effect, electrical resistivity, thermopower, and thermal conductivity measurements between 2 and 300 K on a series of Mm{sub y}Fe{sub 4-x}Co{sub x}Sb{sub 12} samples. The thermoelectric properties of these Mm-filled skutterudites in this low temperature range are comparable to those of pure Ce-filled skutterudites despite the anomalous lattice expansion and distortion. We expect that these materials will have high thermoelectric figures of merit at elevated temperatures.},
doi = {10.1063/1.2794716},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 083702,
volume = 102,
place = {United States},
year = {2007},
month = {1}
}