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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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| Authors: | Tsunehiro Takeuchi Yuichi Terazawa Yukihiro Furuta Akio Yamamoto Masashi Mikami |
| Affiliation: | 1. EcoTopia Science Institute, Nagoya University, Nagoya, 464-8603, Japan 2. Precursory Research for Embryonic Science and Technology, Japanese Science and Technology Agency, Tokyo, 102-0075, Japan 3. Department of Applied Physics, Nagoya University, Nagoya, 464-8603, Japan 4. Department of Crystalline Materials Science, Nagoya University, Nagoya, 464-8603, Japan 5. National Institute of Advanced Industrial Science and Technology, Nagoya, 463-8560, Japan |
| 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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