| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Alloys and Compounds for Thermoelectric and Solar Cell Applications XIII
|
| Presentation Title |
Off-Stoichiometry: A Tool to Enhance the Thermoelectric Performance of Heusler Compounds |
| Author(s) |
Fabian Garmroudi, Takao Mori, Ernst Bauer, Alexander Riss, Michael Parzer |
| On-Site Speaker (Planned) |
Ernst Bauer |
| Abstract Scope |
Full-Heusler alloys based on Fe2VAl turn out to bear large potentials for being used in the 100°C temperature range for power generation, cooling, or wireless sensing. Superior power factors (pf) and excellent mechanical properties, the easy synthesis and the non-poisonous and reasonably priced constituting elements, as well as their respective abundance are essential assets in this respect.
The present talk focuses on a specific tool to modify the electronic structure of full-Heusler compounds and thus to enhance the respective thermoelectric performance, i.e., off-stoichiometry. The underlying cubic crystal structure of such compounds with interpenetrating fcc sublattices allows on each of the constituting elements of the X2YZ formula unit to slightly shift away the atomic content from the integer number. This can dramatically modify the electronic bandstructure, causing e.g., the conversion of a p-type to an n-type conductor, while other properties keep unchanged. Several examples of off-stoichiometric Heusler systems are discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Energy Conversion and Storage, Characterization, Electronic Materials |