| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Alloys and Compounds for Thermoelectric and Solar Cell Applications VIII
|
| Presentation Title |
Multi-band Electronic and Thermal Transport in Fe2VAl Based Full Heusler Thin Films |
| Author(s) |
Ernst Bauer, Bernhard Hinterleitner, Alexander Riss, Takao Mori, Xingqiu Chen |
| On-Site Speaker (Planned) |
Ernst Bauer |
| Abstract Scope |
We have synthesized a series of Fe2(V,W)Al based samples by magnetron sputtering. Besides an astonishingly large value of the power factor, the thermal conductivity appears to be reduced. Consequently, the thermoelectric figure of merit is very large.
In the present work, we are investigating the origin of the large power factor observed and found that a favourable electronic band structure, with multi-valley character and huge charge carrier velocities might be a possible origin for this observation.
Employing Hall effect measurements at high temperatures and high magnetic fields reveal the presence of different sets of charge carriers. Using a modified two-band model, a qualitative and quantitative microscopic picture emerges with substantially enhanced charge carrier mobility values.
This work is supported by the CDL for Thermoelectricity, and the JST, CREST (JPMJCR15Q6, JPMJCR19Q4). Work in China, was supported by Projects No. 51725103, Nos. 51671193 and 51474202, No. TZ2016004. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |