About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Alloys and Compounds for Thermoelectric and Solar Cell Applications X
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Presentation Title |
Rational Band Engineering Leads to Enhanced Thermoelectric Performance of Fe2VAl-type Heusler Compounds |
Author(s) |
Alexander Riss, Fabian Garmroudi, Michael Parzer, Sergii Khmelevskyi, Raimund Podloucky, Kazuki Tobita, Yukari Katsura, Kaoru Kimura, Takao Mori, Ernst Bauer |
On-Site Speaker (Planned) |
Alexander Riss |
Abstract Scope |
The full-Heusler compound Fe2VAl exhibits a small pseudogap, setting a favourable playground for optimizations to achieve a high thermoelectric (TE) performance. Here, we present various electronic measurements of a set of n-type and p-type samples with the composition Fe2V1-xTaxAl1-ySiy in the range of 4 K to 800 K. The results are analyzed semiquantitatively using a parabolic band model and compared with those from density functional theory calculations. The band gap Eg is increased from almost zero toward Eg ~ 0.1 eV with increasing Ta substitution, consistent with the results from ab initio calculations. Due to the enhancement of the Seebeck coefficient, the power factor is boosted up to 10.3 mW/mK2. In addition, the thermal conductivity is further reduced when synthesized as a thin film. |
Proceedings Inclusion? |
Planned: |
Keywords |
Energy Conversion and Storage, Thin Films and Interfaces, Electronic Materials |