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Directional Thermoelectric Performance of Ru2Si3

Published online by Cambridge University Press:  26 February 2011

Benjamin A. Simkin ,
Yoshinori Hayashi  and
Haruyuki Inui
Benjamin A. Simkin
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, Kyoto, 606–8501, Japan
Yoshinori Hayashi
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, Kyoto, 606–8501, Japan
Haruyuki Inui
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, Kyoto, 606–8501, Japan
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Abstract

The orthorhombic compound Ru2Si3 is currently of interest as a high-temperature thermoelectric material. In order to clarify the effects of crystal orientation on the thermoelectric properties of Ru2Si3, we have examined the microstructure, Seebeck coefficient, electrical resistivity, and thermal conductivity of Ru2Si3 along the three principal axes, using these measured quantities to describe the relative thermoelectric performance as a property of crystal orientation. Ru2Si3 undergoes a high temperature (HT)→low temperature (LT) phase change and polycrystalline Si platelet precipitation during cooling, both of which are expected to effect the thermoelectric properties. The HT tetragonal→LT orthorhombic phase transformation results in a [010]//[010], [100]//[001] two-domain structure, while polycrystalline Si precipitation occurs on the (100)LT and (001)LT planes. The [010] orientation is found to posses superior thermoelectric properties (with the dimensionless figure of merit, ZT[010]/ZT[100]>4 at 650°C), due principally to the larger Seebeck coefficient along the [010] direction. The effect of the domain structure on the thermoelectric properties is discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 842: Symposium S – Integrative and Interdisciplinary Aspects of Intermetallics , 2004 , S4.6
Copyright
Copyright © Materials Research Society 2005

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References

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