About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Alloys and Compounds for Thermoelectric and Solar Cell Applications XIV
|
| Presentation Title |
Effects of Grain Size and Misorientation on Thermoelectric Properties of Bismuth-Antimony-Telluride Compounds |
| Author(s) |
Yaron Amouyal |
| On-Site Speaker (Planned) |
Yaron Amouyal |
| Abstract Scope |
Grain boundaries (GBs) can significantly affect thermoelectric (TE) transport properties. We synthesize (Bi1-xSbx)2Te3 compounds by melting and either hand-grinding (HG) or ball-milling (BM) of powders for 30 through 120 min., followed by hot-pressing (HP) to obtain pellets with controlled grain size and GB misorientations. We find that the coarse-grained structure observed for the as-grown (AG) material (1-2 mm) decreases to ca. 3 µm due to HG, then down to sub-µm size upon BM. Longer milling durations lead to increased misorientation angles and emergence of twin GBs. The lattice thermal conductivity exhibits the largest values for the AG samples and the lowest values for the HG ones. This is elucidated in terms of strong {0001} surface texture that declines upon BM, considering that the Te-Te van der Waals (vdW) bonds reduce thermal conductivity along the c-axis. This study provides an original viewpoint on the effects of GBs on TE transport. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Energy Conversion and Storage, Thin Films and Interfaces |