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Splitting of Guest Atom Sites and Lattice Thermal Conductivity in Ba-Ga-Ge Clathrate Compounds

Published online by Cambridge University Press:  01 February 2011

Norihiko L. Okamoto ,
Katsushi Tanaka  and
Haruyuki Inui
Norihiko L. Okamoto
Affiliation:
NLOkamoto@materials.mbox.media.kyoto-u.ac.jp, Kyoto University, Materials Science and Engineering, Yoshida, Sakyo-ku, Kyoto, Kyoto, 606-8501, Japan
Katsushi Tanaka
Affiliation:
k.tanaka@materials.mbox.media.kyoto-u.ac.jp, Kyoto University, Materials Science and Engineering, Japan
Haruyuki Inui
Affiliation:
haruyuki.inui@materials.mbox.media.kyoto-u.ac.jp, Kyoto University, Materials Science and Engineering, Japan
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Abstract

The crystal structures of some type-I and -III clathrate compounds in the Ba-Ga-Ge system have been investigated by synchrotron X-ray powder diffraction at room temperature, paying special attention to the changes of the cage structure and the splitting behavior at the guest atom site upon alloying with Ga. For both types of the clathrate compounds, the split distance of the Ba(2) sites increases with the increase in the Ga content, corresponding to the change in the size and shape of the encapsulating polyhedral cage. Lattice thermal conductivity at room temperature has a positive correlation with the atomic displacement parameter (ADPsplit) based on the split-site model but has an inverse correlation with the split distance of the Ba(2) sites, indicating that a dominant factor of reducing the lattice thermal conductivity is not thermal vibration at the split sites but thermal jump among the split sites.

Keywords

thermoelectricityx-ray diffraction (XRD)thermal conductivity
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 886: Symposium F – Materials and Technologies fore Direct Thermal-to-Electric Energy Conversion , 2005 , 0886-F10-04
Copyright
Copyright © Materials Research Society 2006

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References

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