Thermoelectric properties of Co-,Ir-, and Os-doped FeSi alloys: Evidence for strong electron-phonon coupling

Sales, Brian C.; Delaire, Olivier A.; McGuire, Michael A.; May, Andrew F.

doi:10.1103/PhysRevB.83.125209

Thermoelectric properties of Co-,Ir-, and Os-doped FeSi alloys: Evidence for strong electron-phonon coupling

Journal Article · Mon Feb 28 23:00:00 EST 2011 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.83.125209· OSTI ID:1010577

^[1]; Delaire, Olivier A. ^[1]; ^[1]; ^[1]

ORNL

The effects of various transition-metal dopants on the electrical and thermal transport properties of Fe{sub 1-x}M{sub x}Si alloys (M = Co, Ir, Os) are reported. The maximum thermoelectric figure of merit ZT{sub max} is improved from 0.007 at 60 K for pure FeSi to ZT = 0.08 at 100 K for 4% Ir doping. A comparison of the thermal conductivity data among Os-, Ir-, and Co-doped alloys indicates strong electron-phonon coupling in this compound. Because of this interaction, the common approximation of dividing the total thermal conductivity into independent electronic and lattice components (K{sub total} = K{sub electronic} + K{sub lattice}) fails for these alloys. The effects of grain size on thermoelectric properties of Fe{sub 0.96}Ir{sub 0.04}Si alloys are also reported. The thermal conductivity can be lowered by {approx}50% with little or no effect on the electrical resistivity or Seebeck coefficient. This results in ZT{sub max} = 0.125 at 100 K, still approximately a factor of 5 too low for solid-state refrigeration applications.

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1010577

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 12 Vol. 83; ISSN 1098-0121

Country of Publication:: United States

Language:: English

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