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纳米结构对β-FeSi热电性能的影响。

Effect of Nanostructuring on the Thermoelectric Properties of β-FeSi.

作者信息

Abbassi Linda, Mesguich David, Berthebaud David, Le Tonquesse Sylvain, Srinivasan Bhuvanesh, Mori Takao, Coulomb Loïc, Chevallier Geoffroy, Estournès Claude, Flahaut Emmanuel, Viennois Romain, Beaudhuin Mickaël

机构信息

ICGM, Univ. Montpellier, CNRS, ENSCM, Montpellier, France.

CIRIMAT, CNRS, Université de Toulouse, 118 Route de Narbonne, CEDEX 9, 31062 Toulouse, France.

出版信息

Nanomaterials (Basel). 2021 Oct 26;11(11):2852. doi: 10.3390/nano11112852.

DOI:10.3390/nano11112852
PMID:34835616
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8619856/
Abstract

Nanostructured β-FeSi and β-FeCoSi specimens with a relative density of up to 95% were synthesized by combining a top-down approach and spark plasma sintering. The thermoelectric properties of a 50 nm crystallite size β-FeSi sample were compared to those of an annealed one, and for the former a strong decrease in lattice thermal conductivity and an upshift of the maximum Seebeck's coefficient were shown, resulting in an improvement of the figure of merit by a factor of 1.7 at 670 K. For β-FeCoSi, one observes that the figure of merit is increased by a factor of 1.2 at 723 K between long time annealed and nanostructured samples mainly due to an increase in the phonon scattering and an increase in the point defects. This results in both a decrease in the thermal conductivity to 3.95 W/mK at 330 K and an increase in the power factor to 0.63 mW/mK at 723 K.

摘要

通过结合自上而下的方法和放电等离子烧结，合成了相对密度高达95%的纳米结构β-FeSi和β-FeCoSi样品。将晶粒尺寸为50nm的β-FeSi样品的热电性能与退火样品的热电性能进行了比较，结果表明，前者的晶格热导率显著降低，塞贝克系数最大值上移，在670K时优值提高了1.7倍。对于β-FeCoSi，人们观察到，在长时间退火样品和纳米结构样品之间，723K时的优值提高了1.2倍，这主要是由于声子散射增加和点缺陷增加。这导致在330K时热导率降至3.95W/mK，在723K时功率因数增至0.63mW/mK。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1917/8619856/3918b94256a2/nanomaterials-11-02852-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1917/8619856/0a44617251bd/nanomaterials-11-02852-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1917/8619856/82379ee76cda/nanomaterials-11-02852-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1917/8619856/a138bab61c84/nanomaterials-11-02852-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1917/8619856/a5ffd8f6f7ca/nanomaterials-11-02852-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1917/8619856/95adff72eac8/nanomaterials-11-02852-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1917/8619856/9d3656142fc6/nanomaterials-11-02852-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1917/8619856/3918b94256a2/nanomaterials-11-02852-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1917/8619856/0a44617251bd/nanomaterials-11-02852-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1917/8619856/82379ee76cda/nanomaterials-11-02852-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1917/8619856/a138bab61c84/nanomaterials-11-02852-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1917/8619856/a5ffd8f6f7ca/nanomaterials-11-02852-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1917/8619856/95adff72eac8/nanomaterials-11-02852-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1917/8619856/9d3656142fc6/nanomaterials-11-02852-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1917/8619856/3918b94256a2/nanomaterials-11-02852-g007.jpg

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本文引用的文献

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Defect engineering in thermoelectric materials: what have we learned?热电材料中的缺陷工程：我们学到了什么？
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Doubled Thermoelectric Figure of Merit in p-Type β-FeSi via Synergistically Optimizing Electrical and Thermal Transports.通过协同优化电输运和热输运使p型β-硅化铁的热电优值翻倍
ACS Appl Mater Interfaces. 2020 Mar 18;12(11):12901-12909. doi: 10.1021/acsami.0c00321. Epub 2020 Mar 6.
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β-FeSi中点缺陷的热力学、动力学和电子性质
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