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Improvement of the Thermoelectric Properties of the Chimney–Ladder Compounds in the Ru-Mn-Si System

Published online by Cambridge University Press:  31 January 2011

Norihiko L. Okamoto ,
Yutaka Hashimoto ,
Tatsuya Koyama ,
Hiroki Adachi ,
Kyosuke Kishida ,
Katsushi Tanaka  and
Haruyuki Inui
Norihiko L. Okamoto
Affiliation:
n.okamoto@at4.ecs.kyoto-u.ac.jp, Kyoto University, Materials Science and Engineering, Yoshida, Sakyo-ku, Kyoto, 606-8501, Japan
Yutaka Hashimoto
Affiliation:
hashimo@t01.mbox.media.kyoto-u.ac.jp, Kyoto University, Materials Science and Engineering, Kyoto, Sakyo-ku, Japan
Tatsuya Koyama
Affiliation:
tako@tsuya.mbox.media.kyoto-u.ac.jp, Kyoto University, Department of Materials Science and Engineering, Yoshidahonmachi, Kyoto, Kyoto, 606-8501, Japan
Hiroki Adachi
Affiliation:
hiroki.adachi@materials.mbox.media.kyoto-u.ac.jp, Kyoto University, Department of Materials Science and Engineering, Yoshidahonmachi, Kyoto, Kyoto, 606-8501, Japan
Kyosuke Kishida
Affiliation:
k.kishida@materials.mbox.media.kyoto-u.ac.jp, Kyoto University, Department of Materials Science and Engineering, Sakyo-ku, Kyoto, 606-8501, Japan, +81-75-753-5481, +81-75-753-5461
Katsushi Tanaka
Affiliation:
k.tanaka@materials.mbox.media.kyoto-u.ac.jp, United States
Haruyuki Inui
Affiliation:
haruyuki.inui@materials.mbox.media.kyoto-u.ac.jp, Kyoto University, Department of Materials Science and Engineering, Sakyo-ku, Kyoto, 606-8501, Japan, +81-75-753-5467, +81-75-753-5461
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Abstract

Directionally solidified alloys in the Ru-Mn-Si system exhibit a particular microstructure including columnar compositional variation due to the formation of many different chimney-ladder phases along the growth direction. Despite the existence of the compositional variation, the crystal orientations of the neighboring chimney-ladder phases are preserved. Over the compositional interfaces, the metal sublattice is considered to be continuous while the Si sublattice is not. Heat treatment of the directionally solidified alloy with the nominal composition of Ru0.10Mn0.90Si1.732 at 1100°C coarsens the compositional domains so as to reduce the density of the compositional interfaces. The values of the thermal conductivity increase with the decrease in the density of the compositional interfaces whereas those of the Seebeck coefficient and electrical resistivity are almost unchanged after the heat treatment. It is considered that the thermoelectric properties of the chimney-ladder compounds in the Ru-Mn-Si system can be enhanced by introducing a high density of the compositional interfaces.

Keywords

thermoelectricSithermal conductivity
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1218: Symposium Z – Energy Harvesting–From Fundamentals to Devices , 2009 , 1218-Z06-09
Copyright
Copyright © Materials Research Society 2010

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