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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| Autores principales: | , , , , , , , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/61daefa13d6647fca1d29a568aff9359 |
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| Sumario: | 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. |
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