Transactions of the Indian Institute of Metals

, Volume 70, Issue 1, pp 167–174 | Cite as

Evolution of Thermoelectric β-FeSi2 Phase by Cryo Milling and Sintering

  • V. S. Poddar
  • N. B. Dhokey
  • S. P. Butee
  • N. B. Revade
  • M. M. Thombre
  • R. D. Purohit
  • Deep Prakash
Technical Paper
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Abstract

Development of high temperature thermoelectric materials, like β-FeSi2, is the need of twenty-first century to convert waste heat energy to electrical energy. The increasing interest in bulk semiconducting iron disilicide, β-FeSi2, is due to the advantages of its high thermoelectric power, high absorption coefficient (higher than 105 cm−1 above 1.0 eV) and direct band gap of 0.85 eV. The thermoelectric material is suitable for active component applications such as in light detectors, near-infrared sources, photovoltaic application and optical fiber communication. Powders of pure electrolytic iron and silicon were mechanically alloyed in a Cryo mill for various periods viz. 4, 6 and 8 h. As-milled powders were compacted at 700 MPa and the compacts were then subjected to different heat treatment cycles under vacuum (10−5 bar). The influence of variation in process parameters like milling period and sintering conditions on phase formation was studied. Traces of β-FeSi2 phase appeared after Cryo milling for 6 h. The optimized condition to have nearly complete formation of the β-FeSi2 phase, was found to be the one in which the material was Cryo milled for 6 h which was followed by sintering of compacts at 800 °C for 6 h under vacuum.

Graphical Abstract

XRD analysis of sintered compacts

Keywords

Thermoelectric β-FeSi2 Cryo milling Sintering 
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Copyright information

© The Indian Institute of Metals - IIM 2016

Authors and Affiliations

  • V. S. Poddar
    • 1
  • N. B. Dhokey
    • 1
  • S. P. Butee
    • 1
  • N. B. Revade
    • 1
  • M. M. Thombre
    • 1
  • R. D. Purohit
    • 2
  • Deep Prakash
    • 2
  1. 1.Department of Metallurgy and Materials ScienceCollege of EngineeringPuneIndia
  2. 2.Powder Metallurgy DivisionBhabha Atomic Research CentreNavi MumbaiIndia

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