Effect of Nanostructuring on the Thermoelectric Properties of β-FeSi<sub>2</sub>
Nanostructured β-FeSi<sub>2</sub> and β-Fe<sub>0.95</sub>Co<sub>0.05</sub>Si<sub>2</sub> 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...
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2021
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oai:doaj.org-article:61daefa13d6647fca1d29a568aff93592021-11-25T18:30:21ZEffect of Nanostructuring on the Thermoelectric Properties of β-FeSi<sub>2</sub>10.3390/nano111128522079-4991https://doaj.org/article/61daefa13d6647fca1d29a568aff93592021-10-01T00:00:00Zhttps://www.mdpi.com/2079-4991/11/11/2852https://doaj.org/toc/2079-4991Nanostructured β-FeSi<sub>2</sub> and β-Fe<sub>0.95</sub>Co<sub>0.05</sub>Si<sub>2</sub> 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<sub>2</sub> 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-Fe<sub>0.95</sub>Co<sub>0.05</sub>Si<sub>2</sub>, 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<sup>2</sup> at 723 K.Linda AbbassiDavid MesguichDavid BerthebaudSylvain Le TonquesseBhuvanesh SrinivasanTakao MoriLoïc CoulombGeoffroy ChevallierClaude EstournèsEmmanuel FlahautRomain ViennoisMickaël BeaudhuinMDPI AGarticlepowder technologysinteringnanocrystalline materialsthermal propertiessemiconductorsenergy storage and conversionChemistryQD1-999ENNanomaterials, Vol 11, Iss 2852, p 2852 (2021) |
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powder technology sintering nanocrystalline materials thermal properties semiconductors energy storage and conversion Chemistry QD1-999 |
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powder technology sintering nanocrystalline materials thermal properties semiconductors energy storage and conversion Chemistry QD1-999 Linda Abbassi David Mesguich David Berthebaud Sylvain Le Tonquesse Bhuvanesh Srinivasan Takao Mori Loïc Coulomb Geoffroy Chevallier Claude Estournès Emmanuel Flahaut Romain Viennois Mickaël Beaudhuin Effect of Nanostructuring on the Thermoelectric Properties of β-FeSi<sub>2</sub> |
| description |
Nanostructured β-FeSi<sub>2</sub> and β-Fe<sub>0.95</sub>Co<sub>0.05</sub>Si<sub>2</sub> 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<sub>2</sub> 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-Fe<sub>0.95</sub>Co<sub>0.05</sub>Si<sub>2</sub>, 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<sup>2</sup> at 723 K. |
| format |
article |
| author |
Linda Abbassi David Mesguich David Berthebaud Sylvain Le Tonquesse Bhuvanesh Srinivasan Takao Mori Loïc Coulomb Geoffroy Chevallier Claude Estournès Emmanuel Flahaut Romain Viennois Mickaël Beaudhuin |
| author_facet |
Linda Abbassi David Mesguich David Berthebaud Sylvain Le Tonquesse Bhuvanesh Srinivasan Takao Mori Loïc Coulomb Geoffroy Chevallier Claude Estournès Emmanuel Flahaut Romain Viennois Mickaël Beaudhuin |
| author_sort |
Linda Abbassi |
| title |
Effect of Nanostructuring on the Thermoelectric Properties of β-FeSi<sub>2</sub> |
| title_short |
Effect of Nanostructuring on the Thermoelectric Properties of β-FeSi<sub>2</sub> |
| title_full |
Effect of Nanostructuring on the Thermoelectric Properties of β-FeSi<sub>2</sub> |
| title_fullStr |
Effect of Nanostructuring on the Thermoelectric Properties of β-FeSi<sub>2</sub> |
| title_full_unstemmed |
Effect of Nanostructuring on the Thermoelectric Properties of β-FeSi<sub>2</sub> |
| title_sort |
effect of nanostructuring on the thermoelectric properties of β-fesi<sub>2</sub> |
| publisher |
MDPI AG |
| publishDate |
2021 |
| url |
https://doaj.org/article/61daefa13d6647fca1d29a568aff9359 |
| work_keys_str_mv |
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| _version_ |
1718411077518098432 |