Fast Fabrication of High-Performance CoSb3-Based Thermoelectric Skutterudites via One-Step Yb-Promoted Peritectic Solidification |
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| Authors: | Dou Li Xiao-Lei Shi Zhenyu Feng Meng Li Jiaxi Zhu Xiao Ma Lili Zhang Hong Zhong Wei-Di Liu Shuangming Li Zhi-Gang Chen |
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| Affiliation: | 1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, 710072 P. R. China;2. School of Chemistry and Physics, Queensland University of Technology, Brisbane, Queensland, 4001 Australia;3. School of Chemistry and Physics, Queensland University of Technology, Brisbane, Queensland, 4001 Australia Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, 4072 Australia |
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| Abstract: | 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. |
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| Keywords: | CoSb3 peritectic skutterudite thermoelectric Yb-doping |
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