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Thermoelectric figure of merit of bulk FeSi2–Si0.8Ge0.2 nanocomposite and a comparison with β-FeSi2

Author

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  • Mohebali, Milad
  • Liu, Yin
  • Tayebi, Lobat
  • Krasinski, Jerzy S.
  • Vashaee, Daryoosh

Abstract

Among various thermoelectric (TE) materials, iron disilicide (FeSi2) has relatively low cost and non-toxic characteristics which make it appropriate for large scale applications. To enhance the dimensionless figure of merit (ZT) of this material, a composite of FeSi2–Si0.8Ge0.2 with high fraction of α-FeSi2 was prepared by mechanical alloying and sintering. The process was followed by thermal annealing to transform α to β phase FeSi2 through a slow peritectoid reaction (several hours). The thermoelectric properties were significantly improved upon the completion of the phase transformation. At temperatures above 900 °C, FeSi2 component rapidly changed from β to α phase (several minutes) leading to sudden increase of the thermal conductivity. For comparison, the thermoelectric alloy of β-FeSi2 was prepared through a similar process. The effect of sintering conditions and annealing time were studied and a comparison was drawn between the thermoelectric properties of β-FeSi2 and FeSi2–Si0.8Ge0.2 nanocomposite. Overall, (FeSi2)0.75(Si0.8Ge0.2)0.25 showed 170% enhancement in ZT compared with β-FeSi2 making it suitable for medium to high temperature applications (500 °C −850 °C).

Suggested Citation

  • Mohebali, Milad & Liu, Yin & Tayebi, Lobat & Krasinski, Jerzy S. & Vashaee, Daryoosh, 2015. "Thermoelectric figure of merit of bulk FeSi2–Si0.8Ge0.2 nanocomposite and a comparison with β-FeSi2," Renewable Energy, Elsevier, vol. 74(C), pages 940-947.
    • Handle: RePEc:eee:renene:v:74:y:2015:i:c:p:940-947
    DOI: 10.1016/j.renene.2014.08.059
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    Cited by:

    1. Nozariasbmarz, Amin & Dycus, J. Houston & Cabral, Matthew J. & Flack, Chloe M. & Krasinski, Jerzy S. & LeBeau, James M. & Vashaee, Daryoosh, 2021. "Efficient self-powered wearable electronic systems enabled by microwave processed thermoelectric materials," Applied Energy, Elsevier, vol. 283(C).
    2. Karthick, Krishnadass & Suresh, S. & Singh, Harjit & Joy, Grashin C & Dhanuskodi, R., 2019. "Theoretical and experimental evaluation of thermal interface materials and other influencing parameters for thermoelectric generator system," Renewable Energy, Elsevier, vol. 134(C), pages 25-43.
    3. Hooshmand Zaferani, Sadeq & Ghomashchi, Reza & Vashaee, Daryoosh, 2019. "Strategies for engineering phonon transport in Heusler thermoelectric compounds," Renewable and Sustainable Energy Reviews, Elsevier, vol. 112(C), pages 158-169.

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