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 |
Fabrication of Nanostructured Half-Heusler Compounds via Crystallization of an Amorphous Precursor |
Author(s) |
Pyuck-Pa Choi, Chanwon Jung , Hail Park |
On-Site Speaker (Planned) |
Pyuck-Pa Choi |
Abstract Scope |
Tailoring nanostructures is nowadays a common approach for enhancing the performance of thermoelectric Heusler compounds by decreasing the thermal conductivity without significantly affecting the electrical conductivity. However, the most widely reported method for obtaining nanostructured thermoelectrics, a top-down approach based on crushing as-cast alloy ingots followed by sintering of the debris, only gives limited control of the final nanostructure due to residual elemental segregation. Here, we present a bottom-up approach for fabricating nanostructured Heusler compounds, which is based on crystallizing an amorphous NbCoSn precursor. This method yields distinct nanostructures, comprising only half-Heusler grains or half-Heusler grains and full-Heusler nano-precipitates. Using high-resolution transmission electron microscopy, atom probe tomography, and characterization of transport properties, we give detailed insights into the structure-property relationship of the fabricated specimens. |
Proceedings Inclusion? |
Planned: |
Keywords |
Electronic Materials, Characterization, Energy Conversion and Storage |