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Origin of large thermoelectric power in off-stoichiometric Fe2VAl-based alloys

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The valence-band and core-level soft x-ray photoelectron spectroscopy has been applied to investigate the origin of the large thermoelectric power in the off-stoichiometric and partially-substituted Fe-based Heusler-type alloys Fe2−x−yIryV1+xAl and Fe2−xV1+x−yTiyAl. The non-rigid-band-like change in the valence-band electronic structure near the Fermi level EF is found for the off-stoichiometric change x in Fe and V concentrations, whereas the rigid-bandlike shift of EF is recognized on the Ir or Ti substitution y. The non-rigid-band-like change may be induced by the excess-V or Fe (anti-site defects)-derived states in the pseudogap of Fe2VAl, while the rigid-band-like shift may be caused by a common band formation, where the d states of the substituted elements are incorporated into the main Fe-V 3d bands. The V2p core-level spectra consistently show the satellite structure due to the excess V as the anti-site defect. A model electronic structure is presented for explaining the observed enhancement of their thermoelectric power.

3rd International Congress on Ceramics (ICC3), Symposium 9C: Ceramics for Electricity; Direct Conversion Technology between Heat and Electricity, November 14-18, 2010, Osaka, Japan

identifier:http://dx.doi.org/10.1088/1757-899X/18/14/142004

identifier:http://hdl.handle.net/2237/20775

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詳細情報

  • CRID
    1050845763733576320
  • ISSN
    1757-8981
  • Web Site
    http://hdl.handle.net/2237/20775
  • 本文言語コード
    en
  • 資料種別
    journal article
  • データソース種別
    • IRDB
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