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Thermoelectric Properties of Semiconducting Intermetallic Compounds: FeGa3 and RuGa3

Published online by Cambridge University Press:  01 February 2011

Y. Amagai ,
A. Yamamoto ,
C. H. Lee ,
H. Takazawa ,
T. Noguchi ,
H. Obara ,
T. Iida  and
Y. Takanashi
Y. Amagai
Affiliation:
Department of Material Science and Technology, Tokyo University of Science (TUS), Japan Energy Electronics Institute, National Institute of Advanced Industrial Science and Technology (AIST), Japan
A. Yamamoto
Affiliation:
Energy Electronics Institute, National Institute of Advanced Industrial Science and Technology (AIST), Japan
C. H. Lee
Affiliation:
Energy Electronics Institute, National Institute of Advanced Industrial Science and Technology (AIST), Japan
H. Takazawa
Affiliation:
Energy Electronics Institute, National Institute of Advanced Industrial Science and Technology (AIST), Japan
T. Noguchi
Affiliation:
Energy Electronics Institute, National Institute of Advanced Industrial Science and Technology (AIST), Japan
H. Obara
Affiliation:
Energy Electronics Institute, National Institute of Advanced Industrial Science and Technology (AIST), Japan
T. Iida
Affiliation:
Department of Material Science and Technology, Tokyo University of Science (TUS), Japan
Y. Takanashi
Affiliation:
Department of Material Science and Technology, Tokyo University of Science (TUS), Japan
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Abstract

We report transport properties of polycrystalline TMGa3 (TM = Fe and Ru) compounds in the temperature range 313K<T<973K. These compounds exhibit semiconductorlike behavior with relatively high Seebeck coefficient, electrical resistivity, and Hall carrier concentrations at room temperature in the range of 1017 - 1018cm−3. Seebeck coefficient measurements reveal that FeGa3 is n -type material, while the Seebeck coefficient of RuGa3 changes signs rapidly from large positive values to large negative values around 450K. The thermal conductivity of these compounds is estimated to be 3.5Wm−1K−1 at room temperature and decreased to 2.5Wm−1K−1 for FeGa3 and 2.0Wm−1K−1 for RuGa3 at high temperature. The resulting thermoelectric figure of merit, ZT, at 945K for RuGa3 reaches 0.18.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 793: Symposium S – Thermoelectric Materials 2003 - Research and Applications , 2003 , S8.38
Copyright
Copyright © Materials Research Society 2004

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References

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