| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Alloys and Compounds for Thermoelectric and Solar Cell Applications XI
|
| Presentation Title |
Enhancement of Phonon Scattering in Thermoelectric Half-Heusler Compounds by Non-equilibrium Synthesis |
| Author(s) |
Ran He |
| On-Site Speaker (Planned) |
Ran He |
| Abstract Scope |
Preventing phonon transport remains one of the most challenging tasks to improve the thermoelectric performance of certain materials such as half-Heusler compounds. On the other hand, established strategies such as alloying or grain boundary refinement have almost exhausted their potential to further reduce the lattice thermal conductivity (κL). It is still unclear how to further improve the phononic scattering of these materials. In this talk, I will show that thermal conductivity can be drastically reduced by non-equilibrium synthesis. Two unconventional strategies for thermoelectric studies will be presented, including cryogenic milling and high-pressure sintering. A maximum κL reduction of 83% was achieved at room temperature with a relative density greater than 95%. Our work uncovers the phonon transport properties of half-Heusler compounds under unconventional microstructures, showing the potential of high-pressure compaction and cryogenic milling to advance the performance of thermoelectric materials. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Energy Conversion and Storage, Process Technology, High-Temperature Materials |