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Microstructures and thermoelectric power of the higher manganese silicide alloys

Published online by Cambridge University Press:  21 March 2011

Kimiko Kakubo ,
Yoshisato Kimura  and
Yoshinao Mishima
Kimiko Kakubo
Affiliation:
Tokyo Institute of Technology, Department of Materials Science and Engineering, 4259 Nagatsuta, Midori-ku, Yokohama 226–8502, Japan
Yoshisato Kimura
Affiliation:
Tokyo Institute of Technology, Department of Materials Science and Engineering, 4259 Nagatsuta, Midori-ku, Yokohama 226–8502, Japan
Yoshinao Mishima
Affiliation:
Tokyo Institute of Technology, Department of Materials Science and Engineering, 4259 Nagatsuta, Midori-ku, Yokohama 226–8502, Japan
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Abstract

In the present work, we investigate microstructures and thermoelectric power of the binary higher manganese silicide (hereafter denoted as HMS) base alloys prepared by ingot metallurgy, i.e., arc-melting in an Ar gas atmosphere. Alloys with 63.5, 64.0 and 64.5 at% Si have a small amount of second phase, either the primary metallic MnSi phase or Si solid solution (hereafter denoted as (Si)). A slight revision is thereby made on the HMS single phase region of the Mn-Si binary phase diagram. The presence of MnSi seems to reduce the thermoelectric power of the HMS, while that of (Si) enhances it. An alloy having the HMS/(Si) eutectic microstructure, 67.9at%Si, shows the highest thermoelectric power in the Mn-Si binary alloys examined. Moreover, effect of doping the p-type elements, Fe and Cr, on the thermoelectric power and microstructural features is also investigated for a 63.5at%Si alloy which consists mostly of HMS phase with a small amount of (Si) phase. It is shown that both elements, especially 0.5 at% Cr addition, enhance the thermoelectric power of the alloys.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 646 , 2000 , N2.9.1
Copyright
Copyright © Materials Research Society 2001

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Footnotes

*

Graduate Student. [email protected]

References

REFERENCES

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