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Thermoelectric properties of Ba-Ge based Type-III Clathrate Compounds

Published online by Cambridge University Press:  26 February 2011

Jung-Hwan Kim ,
Norihiko L. Okamoto ,
Kyosuke Kishida ,
Katsushi Tanaka  and
Haruyuki Inui
Jung-Hwan Kim
Affiliation:
JHKim@materials.mbox.media.kyoto-u.ac.jp, Kyoto University, Materials Science and Engineering, Sakyo-ku, Kyoto, 606-8501, Japan
Norihiko L. Okamoto
Affiliation:
nlokamoto@ucdavis.edu, Kyoto University, Department of Materials Science and Engineering, Sakyo-ku, Kyoto, 606-8501, Japan
Kyosuke Kishida
Affiliation:
k.kishida@materials.mbox.media.kyoto-u.ac.jp, Kyoto University, Department of Materials Science and Engineering, Sakyo-ku, Kyoto, 606-8501, Japan
Katsushi Tanaka
Affiliation:
k.tanaka@materials.mbox.media.kyoto-u.ac.jp, Kyoto University, Department of Materials Science and Engineering, Sakyo-ku, Kyoto, 606-8501, Japan
Haruyuki Inui
Affiliation:
haruyuki.inui@materials.mbox.media.kyoto-u.ac.jp, Kyoto University, Department of Materials Science and Engineering, Sakyo-ku, Kyoto, 606-8501, Japan
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Abstract

The crystal structures and thermoelectric properties of Ba-Ge based type-III clathrate compounds in Ba-Al-Ge and Ba-In-Ge systems have been investigated as a function of Al and In content. The absolute values of electrical resistivity and Seebeck coefficient increase, while that of lattice thermal conductivity decreases with increasing Al and In content. The increase in electrical resistivity and Seebeck coefficient is discussed in terms of the number of the excess electrons deduced from the Zintl concept, on the other hand, the decrease in lattice thermal conductivity is discussed in terms of an anisotropic deformation of the open-dodecahedron cage encapsulating Ba atom. High ZT values of 0.74 and 0.87 are obtained at 780 and 580 °C for Ba24Al12Ge88 and Ba24In16Ge84, respectively.

Keywords

thermoelectricitycrystallographic structurethermal conductivity
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 980: Symposium II – Advanced Intermetallic-Based Alloys , 2006 , 0980-II04-05
Copyright
Copyright © Materials Research Society 2007

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References

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