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Fabrication of Mg2Si from a Reused-silicon Source and its Thermoelectric Characteristics

Published online by Cambridge University Press:  01 February 2011

Masayasu Akasaka ,
Tsutomu Iida ,
Youhiko Mito ,
Takeru Omori ,
Yohei Oguni ,
Shigeki Yokoyama ,
Keishi Nishio  and
Yoshifumi Takanashi
Masayasu Akasaka
Affiliation:
[email protected], Tokyo University of Science, Department of Materials Science and Technology, 2641 Yamazaki, Noda, 278-8510, Japan
Tsutomu Iida
Affiliation:
[email protected], Tokyo University of Science, Department of Materials Science and Technology, 2641 Yamazaki, Noda-shi, Chiba, 278-8510, Japan
Youhiko Mito
Affiliation:
[email protected], Showa KDE Co.,Ltd., 30-13, Motoyoyogi-cho, Shibuya-ku, Tokyo, 151-0062, Japan
Takeru Omori
Affiliation:
[email protected], Tokyo University of Science, Department of Materials Science and Technology, 2641 Yamazaki, Noda-shi, Chiba, 278-8510, Japan
Yohei Oguni
Affiliation:
[email protected], Tokyo University of Science, Department of Materials Science and Technology, 2641 Yamazaki, Noda-shi, Chiba, 278-8510, Japan
Shigeki Yokoyama
Affiliation:
[email protected], Showa KDE Co.,Ltd., 30-13, Motoyoyogi-cho, Shibuya-ku, Tokyo, 151-0062, Japan
Keishi Nishio
Affiliation:
[email protected], Tokyo University of Science, Department of Materials Science and Technology, 2641 Yamazaki, Noda-shi, Chiba, 278-8510, Japan
Yoshifumi Takanashi
Affiliation:
[email protected], Tokyo University of Science, Department of Materials Science and Technology, 2641 Yamazaki, Noda-shi, Chiba, 278-8510, Japan
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Abstract

Polycrystalline Mg2Si was fabricated from a reused-Silicon source, based on Si sludge, using Spark Plasma Sintering technique. The n-type and p-type dopants, bismuth (Bi) and silver (Ag), respectively, were incorporated into the Mg2Si. The thermoelectric properties were estimated from 300 to 873K. The power factors of undoped and Bi-doped samples from the reused-Si source were comparable to those from a solar grade Si source (99.99999%). The power factor was estimated to be 2.5 × 10-5 W/cmK2 for the Bi-doped sample from the reused-Si source. However, the power factor of the Ag-doped, p-type sample from the reused-Si source was lower than that from solar grade Si source. The dimensionless figures of merit of samples from the resused-Si source were slightly lower than those from a solar grade Si source. The dimensionless figure of merit was estimated to be 0.53 at 812 K for Bi-doped sample from the reused-Si source.

Keywords

thermoelectricityenvironmentally benignsintering
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1044: Symposium U – Thermoelectric Power Generation , 2007 , 1044-U06-15
Copyright
Copyright © Materials Research Society 2008

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