摘要
As a most promising mid-temperature thermoelectric material, CoSb3-based bulk material exhibits an applicable figure-of-merit (ZT) of more than one. However, their fabrication is historically time-consuming due to the long-time solid-state phase transitions from CoSb2 to CoSb3. To overcome this challenge, here, a fast one-step process is developed to fabricate n-type Yb-doped CoSb3 with stable ZT of 1.12 at 765 K in <5 h. Experiments confirm Yb promotes peritectic reactions of CoSb + Liquid → CoSb2 and CoSb2 + Liquid → CoSb3, optimizes power factor, and suppresses thermal conductivity. Moreover, the dense grains, induced by the one-step crystallization, result in outstanding mechanical properties with a Young's modulus of 171.4 GPa and a hardness of 8.8 GPa in the Yb-doped CoSb3. This study indicates that the fast one-step fabrication route can effectively promote the practical applications of CoSb3-based thermoelectrics and provide guidance for thermoelectric fabrication via rational phase design.
源语言 | 英语 |
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文章编号 | 2305269 |
期刊 | Advanced Functional Materials |
卷 | 33 |
期 | 46 |
DOI | |
出版状态 | 已出版 - 9 11月 2023 |