| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Alloys and Compounds for Thermoelectric and Solar Cell Applications XIII
|
| Presentation Title |
Improved Thermal Stability and Enhanced Thermoelectric Performance by Increasing the Crystallinity of β-Zn4Sb3 |
| Author(s) |
I-Lun Jen, Hsin-Jay Wu |
| On-Site Speaker (Planned) |
I-Lun Jen |
| Abstract Scope |
Tellurium-free β-Zn4Sb3 exhibits moderate thermoelectric figure-of-merits in the mid-temperature range. However, Zn atom disordering and Zn interstitials in the β-Zn4Sb3 lattice pose challenges to maintaining structural stability. In this work, two samples with identical nominal compositions were synthesized differently: one was grown by the Bridgman method (the SC sample), and the other underwent a furnace cooling process (the Poly sample). The SC sample exhibited distinct crystallographic peaks, indicating high crystallinity, while the Poly sample was polycrystalline. Despite similar zT values at ambient temperature, the SC sample outperformed the Poly sample at high temperatures, achieving a peak zT of 1.0 at 623 K, which is 150% higher than the Poly sample. The SC sample demonstrated superior electrical and thermal properties and fewer zinc whiskers, resulting in better thermoelectric performance and stability. Enhancing crystallinity and reducing defect density are key to making β-Zn4Sb3 a practical thermoelectric generator. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Electronic Materials, Energy Conversion and Storage, |