Off-stoichiometric Effects on Thermoelectric Properties of Fe2VAl-based Compounds

DOI Web Site 11 Citations 29 References
  • Sandaiji Yusuke
    Department of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology
  • Ide Naoki
    Department of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology
  • Nishino Yoichi
    Department of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology
  • Ohwada Takeshi
    School of Engineering, Nagoya University
  • Harada Shota
    Department of Quantum Engineering, Graduate School of Engineering, Nagoya University
  • Soda Kazuo
    Department of Quantum Engineering, Graduate School of Engineering, Nagoya University

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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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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.

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