Hostname: page-component-76fb5796d-9pm4c Total loading time: 0 Render date: 2024-04-26T12:32:10.358Z Has data issue: false hasContentIssue false
  • English
  • Français

Effect of Ga-doping on the Thermoelectric Properties of Ba-Ge Type-III Clathrate Compounds

Published online by Cambridge University Press:  01 February 2011

Jung-Hwan Kim ,
Norihiko L. Okamoto ,
Katsushi Tanaka  and
Haruyuki Inui
Jung-Hwan Kim
Affiliation:
JHKim@materials.mbox.media.kyoto-u.ac.jp, Kyoto University, Dept. Of Materials Science And Engineering, Sakyo-ku, Kyoto, N/A, 606-8501, Japan
Norihiko L. Okamoto
Affiliation:
NLOkamoto@materials.mbox.media.kyoto-u.ac.jp, Kyoto University, Department of Materials Science and Engineering, Japan
Katsushi Tanaka
Affiliation:
k.tanaka@materials.mbox.media.kyoto-u.ac.jp, Kyoto University, Department of Materials Science and Engineering, Japan
Haruyuki Inui
Affiliation:
haruyuki.inui@materials.mbox.media.kyoto-u.ac.jp, Kyoto University, Department of Materials Science and Engineering, Japan
Get access

Abstract

Effect of Ga addition on the thermoelectric properties of Ba-Ge type-III clathrate has been investigated as a function of Ga content and temperature. The substitution of Ga atom for Ge atom leads to the decrease of carrier (electron) concentration. Electrical conduction is of n-type for all clathrate compounds investigated and the values of electrical resistivity and Seebeck coefficient increase with the increase in the Ga content and in temperature. Both electronic and lattice thermal conductivity decrease with the increase in the Ga content because of the decreased carrier concentration and the increased extent of the rattling motion of Ba atoms encapsulated in open-dodecahedron, respectively. A very high ZT value of 1.25 is obtained at 670 °C for Ba24Ga15Ge85.

Keywords

thermoelectricitythermal conductivityelectrical properties
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-F10-05
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

REFERENCE

1. Slack, G. A., “CRC Handbook of Thermoelectrics”, ed. Rowe, D. M. (CRC Press, Boca Raton, Florida, 1995) pp. 407.Google Scholar
2. Nolas, G. S., Cohn, J. L., Slack, G. A. and Schujman, S. B., Appl. Phys. Lett. 73, 178 (1998).Google Scholar
3. Carrillo-Cabrera, W., Curda, J., von Schnering, H.G., Paschen, S. and Grin, Yu., Z. Kristallogr. 215, 207 (2000).Google Scholar
4. Shimizu, H., Kume, T., Kuroda, T., Sasaki, S., Fukuoka, H. and Yamanaka, S., Phys. Rev. B. 71, 094108 (2005).Google Scholar
5. Paschen, S., Tran, V.H., Baenitz, M., Carrillo-Cabrera, W., Grin, Yu. and Steglich, E., Phys. Rev. B. 65, 134435 (2002).Google Scholar
6. 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
8. Okamoto, N. L., Kishida, K., Tanaka, K. and Inui H [submitted].Google Scholar