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Journal of Materials Science

, Volume 50, Issue 20, pp 6713–6718 | Cite as

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

  • U. Ail
  • S. GorsseEmail author
  • S. Perumal
  • M. Prakasam
  • A. Umarji
  • S. Vivès
  • P. Bellanger
  • R. Decourt
Original Paper

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.

Keywords

Aging Temperature Thermoelectric Property Seebeck Coefficient Phonon Scattering Lattice Thermal Conductivity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgement

This work was supported by a research grant from the Indo-French Centre for the Promotion of Advanced Research, IFCPAR/CEFIPRA (Program No. 4008-2).

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • U. Ail
    • 1
  • S. Gorsse
    • 1
    • 2
    • 3
    Email author
  • S. Perumal
    • 1
  • M. Prakasam
    • 1
  • A. Umarji
    • 4
  • S. Vivès
    • 3
  • P. Bellanger
    • 3
  • R. Decourt
    • 1
  1. 1.CNRS, ICMCB, UPR 9048PessacFrance
  2. 2.Bordeaux INP, ICMCB, UPR 9048PessacFrance
  3. 3.Univ. Bordeaux, ICMCB, UPR 9048PessacFrance
  4. 4.Materials Research CentreIndian Institute of ScienceBangaloreIndia

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