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Effect of Heavy Element Substitution and Off-Stoichiometric Composition on Thermoelectric Properties of Fe2VAl-Based Heusler Phase

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Abstract

The thermoelectric performance of Fe2VAl-based alloys was improved by using the effects of (a) heavy element substitution and (b) off-stoichiometric (Fe/V ≠ 2) composition. The former method led to a significant reduction of lattice thermal conductivity, whereas the latter to an evolution of the Seebeck coefficient. As a result of sample preparation, we confirmed that the dimensionless figure of merit with n-type behavior was increased up to 0.25 at 420 K for the sample obtained at the optimized composition of Fe1.98V0.97Ta0.05Al0.9Si0.1. Electronic structure calculations revealed that the increase of the Seebeck coefficient observed for Fe-poor samples was caused by a reduction of the density of states near the chemical potential.

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Authors and Affiliations

  1. EcoTopia Science Institute, Nagoya University, Nagoya, 464-8603, Japan

    Tsunehiro Takeuchi

  2. Precursory Research for Embryonic Science and Technology, Japanese Science and Technology Agency, Tokyo, 102-0075, Japan

    Tsunehiro Takeuchi

  3. Department of Applied Physics, Nagoya University, Nagoya, 464-8603, Japan

    Tsunehiro Takeuchi, Yuichi Terazawa & Yukihiro Furuta

  4. Department of Crystalline Materials Science, Nagoya University, Nagoya, 464-8603, Japan

    Tsunehiro Takeuchi & Akio Yamamoto

  5. National Institute of Advanced Industrial Science and Technology, Nagoya, 463-8560, Japan

    Masashi Mikami

Authors
  1. Tsunehiro Takeuchi
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  2. Yuichi Terazawa
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  3. Yukihiro Furuta
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  4. Akio Yamamoto
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  5. Masashi Mikami
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Correspondence to Tsunehiro Takeuchi.

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Takeuchi, T., Terazawa, Y., Furuta, Y. et al. Effect of Heavy Element Substitution and Off-Stoichiometric Composition on Thermoelectric Properties of Fe2VAl-Based Heusler Phase. J. Electron. Mater. 42, 2084–2090 (2013). https://doi.org/10.1007/s11664-013-2532-0

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  • DOI: https://doi.org/10.1007/s11664-013-2532-0

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