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Enhanced thermoelectric performance of higher manganese silicides by shock-induced high dense dislocations

Abstract

Minimizing the lattice thermal conductivity (кL) in thermoelectric (TE) materials is a widely applied strategy to improve their thermoelectric performance. Dislocations have been demonstrated to be effective to scatter the mid-frequency phonons, which can dramatically reduce the кL combining with the nanostructures and point defects. Generally, the plastic deformation is the most straightforward method to generate dislocations in an alloy. However, most TE materials can not readily plastically deform due to their brittleness. Here, we demonstrate that shock compression is effective to generate high dense dislocations (~7.91012/cm2) in TE materials. Shock compression is an extreme regime of deformation with ultra-high strain rates (>106 s-1) and high pressures (~GPa), combining with high temperature during the process. Using this method, multi-scale hierarchical architectures were fabricated in higher manganese silicides (HMS) with nano-size grains and high dense dislocations. An ultralow lattice thermal conductivity of 1.5 Wm-1K-1 has been achieved in HMS compounds, and the maximum ZT was increased by 47% to 1.0, which is higher than most of the ZT values reported on HMS compounds. These results not only demonstrates the dense dislocations can lower кL and improve the ZT of HMS, but also extend the application of shock compression to design advanced TE materials.

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Publication details

The article was received on 23 Nov 2018, accepted on 04 Jan 2019 and first published on 04 Jan 2019


Article type: Paper
DOI: 10.1039/C8TA11292D
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript
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    Enhanced thermoelectric performance of higher manganese silicides by shock-induced high dense dislocations

    Z. Gao, Z. Xiong, J. Li, C. Lu, G. Zhang, T. Zeng, Y. Ma, G. Ma, R. Zhang, K. Chen, T. Zhang, Y. Liu, J. Yang, L. Cao and K. Jin, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C8TA11292D

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