Effect of evolution for dispersed phase on thermoelectric performance of Yb0.2(CoSb2.875Te0.125)4
| Autor: | Xu-Ye Xin, Lu-Heng Hu, Zi-Han Lv, Hong-Quan Liu, Chun-Zhi Zhang, Qing-Kun He, Tong Zhang |
|---|---|
| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | The European Physical Journal Applied Physics. 97:9 |
| ISSN: | 1286-0050 1286-0042 |
| DOI: | 10.1051/epjap/2022210231 |
| Popis: | CoSb3-based skutterudites, as a medium-temperature thermoelectric material, show excellent thermoelectric performance, but high thermal conductivity suppresses the high ZT value. Here, x% SnTe/Yb0.2(CoSb2.875Te0.125)4 samples were synthesized through vacuum melting reaction and spark plasma sintering (SPS). With increasing of SnTe content, the dispersed phase CoSb2, SnTe and CoTe2 appear successively via a selection of nucleation kinetics for 1%, 3% and 5% SnTe composited sample. Due to scattering of the dispersed phase and the solid solution distortion, lattice conductivity (κlat) of the 3% SnTe/Yb0.2(CoSb2.875Te0.125)4 sample decreases from 1.55 W m−1 K−1 to 1.19 W m−1 K−1 compared with the Yb0.2(CoSb2.875Te0.125)4 sample, which reduces by ∼22.8% at 773 K. The maximum thermoelectric merit ZT of the 3% SnTe/Yb0.2(CoSb2.875Te0.125)4 sample achieves 1.18 at 773 K. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|