Doping Effects on Thermoelectric Properties of Higher Manganese Silicides (HMSs, MnSi1.74) and Characterization of Thermoelectric Generating Module using $ p$-Type (Al, Ge and Mo)-doped HMSs and $n$-Type Mg2Si0.4Sn0.6 Legs

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概要

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• The effect of Al Doping on the thermoelectric properties of higher manganese silicides, MnSi1.74 (HMSs) parallel and perpendicular to the $c$-axis was investigated. It was found that Al doping increased electrical conductivity and decreased thermoelectric power parallel to the $c$-axis, because Al doping of the Si site increased carrier density according to the valence control rule. Al doping was also effective for lowering thermal conductivity and raising the figure of merit parallel to the $c$-axis. After optimizing the Al content ($y=0.0035$), the thermoelectric properties of (Al, Ge and Mo)-doped HMSs parallel and perpendicular to the $c$-axis were evaluated and compared to those of nondoped and Al-doped HMSs. Two types of thermoelectric module consisting of $n$-type Mg2Si0.4Sn0.6 and $ p$-type (Al, Ge and Mo)-doped HMSs legs parallel (or perpendicular) to the $c$-axis were fabricated, and their thermoelectric performances were compared to each other. The discrepancy between the measured maximum output power and the value estimated from the thermoelectric data of constituent materials was well explained by the resistance of a porous Al electrode. The measured heat flux of the module was also compared to the estimated heat flux. The maximum energy conversion efficiency of the module parallel to the $c$-axis was clearly higher than that perpendicular to the $c$-axis, because of a higher output power and a lower heat flux, and was higher than 7% at $\Delta T=520$ K (303–823 K).

• Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
• 2005-06-15

著者

• KAIBE Hiromasa

  Research Center, Komatsu Ltd.

• Mukoujima Mika

  Research Center Komatsu Ltd.

• Rauscher Lutz

  Research Center Komatsu Ltd.

• Kanda Toshio

  Research Center Komatsu Ltd.

• Kaibe Hiromasa

  Research Center Komatsu Ltd.

• TSUJI Toshihide

  School of Materials Science, Japan Advanced Institute of Science and Technology

• Tsuji Toshihide

  School Of Materials Science Japan Advanced Institute Of Science And Technology

• Aoyama Ikuto

  Research Center, Komatsu Ltd., Manda 1200, Hiratsuka, Kanagawa 254-8567, Japan

• Sano Seijiro

  Research Center, Komatsu Ltd., Manda 1200, Hiratsuka, Kanagawa 254-8567, Japan

• Aoyama Ikuto

  Research Center Komatsu Ltd.

• Sano Seijiro

  Research Center Komatsu Ltd.

関連論文

• Improved Thermoelectric Properties in Structure Controlled Ag-Sb-Te System
• Synergy Effect of Simultaneous Zinc and Nickel Addition on Cobalt Deposition onto Stainless Steel in Oxygenated High Temperature Water
• Doping Effects on Thermoelectric Properties of Higher Manganese Silicides (HMSs, MnSi1.74) and Characterization of Thermoelectric Generating Module using $ p$-Type (Al, Ge and Mo)-doped HMSs and $n$-Type Mg2Si0.4Sn0.6 Legs
• Effects of Ge Doping on Micromorphology of MnSi in MnSi_ and on Their Thermoelectric Transport Properties
• Effects of Ge Doping on Micromorphology of MnSi in MnSi∼ 1.7 and on Their Thermoelectric Transport Properties

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