Off-stoichiometric Effects on Thermoelectric Properties of Fe2VAl-based Compounds
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- Sandaiji Yusuke
- Department of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology
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- Ide Naoki
- Department of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology
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- Nishino Yoichi
- Department of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology
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- Ohwada Takeshi
- School of Engineering, Nagoya University
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- Harada Shota
- Department of Quantum Engineering, Graduate School of Engineering, Nagoya University
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- Soda Kazuo
- Department of Quantum Engineering, Graduate School of Engineering, Nagoya University
Bibliographic Information
- Other Title
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- Fe2VAl系ホイスラー化合物の熱電特性に及ぼす非化学量論組成の効果
- Fe2VAlケイ ホイスラー カゴウブツ ノ ネツデン トクセイ ニ オヨボス ヒ カガクリョウロン ソセイ ノ コウカ
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Description
We report on the thermoelectric properties of Fe2-x(V1+x-yTiy)Al alloys (−0.04≤x≤0.02, 0≤y≤0.10). While a small deviation from the stoichiometric Fe2VAl composition causes an enhancement in the Seebeck coefficient, a slight substitution of Ti for V leads to a further increase in the Seebeck coefficient and a decrease in the electrical resistivity. The Seebeck coefficient reaches 110 μV/K at 300 K for x=−0.04 and y=0.03, which is the largest in the p-type Fe2VAl-based alloys so far reported. The electronic structures of Fe2-xV1+xAl alloys with x=−0.04, 0 and 0.02 have been investigated by soft X-ray photoelectron spectroscopy. The valence-band spectra near the EF of Fe-rich alloy (x=−0.04) is drastically changed from that of the stoichiometric Fe2VAl. Therefore substantial enhancements in the Seebeck coefficient for the off-stoichiometric alloys could be due to a modification in the band structure on the valence band side around the Fermi level EF.
Journal
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- Journal of the Japan Society of Powder and Powder Metallurgy
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Journal of the Japan Society of Powder and Powder Metallurgy 57 (4), 207-212, 2010
Japan Society of Powder and Powder Metallurgy
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Details 詳細情報について
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- CRID
- 1390001206307385472
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- NII Article ID
- 10026346479
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- NII Book ID
- AN00222724
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- COI
- 1:CAS:528:DC%2BC3cXlsl2gs7w%3D
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- ISSN
- 18809014
- 05328799
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- NDL BIB ID
- 10673893
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed