Journal of Materials Science

, Volume 48, Issue 17, pp 6018–6024 | Cite as

Thermoelectric properties of chromium disilicide prepared by mechanical alloying

  • S. Perumal
  • S. Gorsse
  • U. Ail
  • M. Prakasam
  • B. Chevalier
  • A. M. Umarji
Article

Abstract

CrSi and Cr1−xFexSi particles embedded in a CrSi2 matrix have been prepared by hot pressing from CrSi1.9, CrSi2, and CrSi2.1 powders produced by ball milling using either WC or stainless steel milling media. The samples were characterized by powder X-ray diffraction, scanning, and transmission electron microscopy and electron microprobe analysis. The final crystallite size of CrSi2 obtained from the XRD patterns is about 40 and 80 nm for SS- and WC-milled powders, respectively, whereas the size of the second phase inclusions in the hot pressed samples is about 1–5 μm. The temperature dependence of the electrical resistivity, Seebeck coefficient, thermal conductivity, and figure of merit (ZT) were analyzed in the temperature range from 300 to 800 K. While the ball-milling process results in a lower electrical resistivity and thermal conductivity due to the presence of the inclusions and the refinement of the matrix microstructure, respectively, the Seebeck coefficient is negatively affected by the formation of the inclusions which leads to a modest improvement of ZT.

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • S. Perumal
    • 1
  • S. Gorsse
    • 2
  • U. Ail
    • 2
  • M. Prakasam
    • 2
  • B. Chevalier
    • 2
  • A. M. Umarji
    • 1
  1. 1.Materials Research CentreIndian Institute of ScienceBangaloreIndia
  2. 2.CNRS, ICMCBUniversity of BordeauxPessac CedexFrance

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