Hostname: page-component-586b7cd67f-rdxmf Total loading time: 0 Render date: 2024-11-23T18:04:45.353Z Has data issue: false hasContentIssue false
  • English
  • Français

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:
[email protected], Kyoto University, Materials Science and Engineering, Yoshida, Sakyo-ku, Kyoto, Kyoto, 606-8501, Japan
Katsushi Tanaka
Affiliation:
[email protected], Kyoto University, Materials Science and Engineering, Japan
Haruyuki Inui
Affiliation:
[email protected], Kyoto University, Materials Science and Engineering, Japan
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Eisenmann, B., Schäfer, H., and Zagler, R., J. Less-Common Met. 118, 43 (1986).Google Scholar
2. Kasper, J. S., Hagenmuller, P., Pouchard, M., and Cros, C., Science 150, 1713 (1965).Google Scholar
3. Fukuoka, H., Iwai, K., Yamanaka, S., Abe, H., Yoza, K. and Häming, L., J. Solid State Chem. 151, 117 (2000).Google Scholar
4. Kim, S.-J., Hu, S., Uher, C., Hogan, T., Huang, B., Corbett, J.D. and Kanatzidis, M.G., J. Solid State Chem. 153, 321 (2000).Google Scholar
5. Leoni, , Carrillo-Cabrera, W. and Grin, Y., J. Alloys Compd. 350, 113 (2003).Google Scholar
6. Nolas, G.S. in Semiconductor Clathrates: A PGEC System with Potential for Thermoelectric Applications, edited by Tritt, T.M., Lyon, H.B. Jr, Mahan, G. and Kanatzidis, M.G., (Mater. Res. Soc. Symp. Proc. 545, Pittsburgh, PA, 1999) pp. 435–442.Google Scholar
7. Sales, B.C., Chakoumakos, B.C., Jin, R., Thompson, J.R. and Mandrus, D., Phys. Rev. B, 63, 245113 (2001).Google Scholar
8. Gómez, C.P. and Lidin, S., Phys. Rev. B, 68, 024203 (2003).Google Scholar
9. Izumi, F. and Ikeda, T., Mater. Sci. Forum, 321, 198 (2000).Google Scholar
10. Touloukian, Y., Thermophysical Properties of Matter, Vol. 2, (Plenum, New York, 1970) pp. 182–193.Google Scholar