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Effect of Nanostructuring on the Thermoelectric Properties of β-FeSi2

Abbassi, Linda and Mesguich, David and Berthebaud, David and Le Tonquesse, Sylvain and Srinivasan, Bhuvanesh and Mori, Takao and Coulomb, Loïc and Chevallier, Geoffroy and Estournès, Claude and Flahaut, Emmanuel and Viennois, Romain and Beaudhuin, Mickaël Effect of Nanostructuring on the Thermoelectric Properties of β-FeSi2. (2021) Nanomaterials, 11 (11). 2852. ISSN 2079-4991

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Official URL: https://doi.org/10.3390/nano11112852

Abstract

Nanostructured β-FeSi2 and β-Fe0.95Co0.05Si2 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-FeSi2 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-Fe0.95Co0.05Si2, 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/mK2 at 723 K.

Item Type:Article
HAL Id:hal-03431689
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Saint-Gobain (FRANCE)
Other partners > National Institute for Materials Science - NIMS (JAPAN)
Laboratory name:
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Deposited On:16 Nov 2021 17:56

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