Thermal conductivity of β-FeSi2/Si endogenous composites formed by the eutectoid decomposition of α-Fe2Si5

Abstract : Thermoelectric properties of semiconducting β-FeSi2 containing a homogeneous distribution of Si secondary phase have been studied. The synthesis was carried out using arc melting followed by the densification by uniaxial hot pressing. Endogenous β-FeSi2/Si composites were produced by the eutectoid decomposition of high-temperature α-Fe2Si5 phase. The aging heat treatments have been carried out at various temperatures below the equilibrium eutectoid temperature for various durations in order to tune the size of the eutectoid product. Thermal properties of the samples were studied in the temperature range of 100–350 °C. The microstructural investigations support the fact that the finest microstructure generated through the eutectoid decomposition of the α-Fe2Si5 metastable phase is responsible of the phonon scattering. The results suggest an opportunity to produce bulk iron silicide alloys with reduced thermal conductivity in order to enhance its thermoelectric performance.
Type de document :
Article dans une revue
Journal of Materials Science, Springer Verlag, 2015, 50 (20), pp.6713-6718. 〈10.1007/s10853-015-9225-4〉
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https://hal.archives-ouvertes.fr/hal-01180877
Contributeur : Stéphane Toulin <>
Soumis le : mardi 28 juillet 2015 - 13:24:01
Dernière modification le : jeudi 3 mai 2018 - 19:03:09

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Ujwala Ail, Stéphane Gorsse, S. Perumal, Mythili Prakasam, Arun M. Umarji, et al.. Thermal conductivity of β-FeSi2/Si endogenous composites formed by the eutectoid decomposition of α-Fe2Si5. Journal of Materials Science, Springer Verlag, 2015, 50 (20), pp.6713-6718. 〈10.1007/s10853-015-9225-4〉. 〈hal-01180877〉

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