Low-temperature transport properties of the filled and unfilled IrSb3 skutterudite system

Terry M. Tritt, G. S. Nolas, G. A. Slack, A. C. Ehrlich, D. J. Gillespie, Joshua Cohn

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Abstract

We have measured the electrical resistivity, ρ, thermoelectric power, α, and thermal conductivity, κ, of the skutterudite material IrSb3 in a temperature range from 300 down to 4 K. It is found that the electrical resistivity and thermopower decrease monotonically as the temperature is reduced to 50-60 K. Below approximately 60 K the resistivity rises in a semiconducting manner. It appears the thermopower exhibits a large phonon drag peak at around 20 K and then falls towards zero. The thermal conductivity increases rapidly as the temperature is decreased with a maximum at around 20 K, corresponding to the peak in the thermopower. We will discuss these results and compare them to higher temperature data from G. A. Slack and V. G. Tsoukala [(IrSb3) J. Appl. Phys. 76, 1635 (1994)]. We have also measured some of the so-called "filled skutterudites," Ir4LaGe3Sb9, Ir4NdGe3Sb9 and Ir4SaGe3Sb9. The thermoelectric properties of these materials are considerably different than those of the unfilled sample. The thermopower is considerably lower and the resistivity is a factor of 2-4 times higher than the unfilled sample at room temperature. The thermal conductivity is markedly reduced by the filling, as much as a factor of 20 reduction for some of the systems.

Original languageEnglish (US)
Pages (from-to)8412-8418
Number of pages7
JournalJournal of Applied Physics
Volume79
Issue number11
StatePublished - Jun 1 1996

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transport properties
electrical resistivity
thermal conductivity
drag
temperature
room temperature

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physics and Astronomy (miscellaneous)

Cite this

Tritt, T. M., Nolas, G. S., Slack, G. A., Ehrlich, A. C., Gillespie, D. J., & Cohn, J. (1996). Low-temperature transport properties of the filled and unfilled IrSb3 skutterudite system. Journal of Applied Physics, 79(11), 8412-8418.

Low-temperature transport properties of the filled and unfilled IrSb3 skutterudite system. / Tritt, Terry M.; Nolas, G. S.; Slack, G. A.; Ehrlich, A. C.; Gillespie, D. J.; Cohn, Joshua.

In: Journal of Applied Physics, Vol. 79, No. 11, 01.06.1996, p. 8412-8418.

Research output: Contribution to journalArticle

Tritt, TM, Nolas, GS, Slack, GA, Ehrlich, AC, Gillespie, DJ & Cohn, J 1996, 'Low-temperature transport properties of the filled and unfilled IrSb3 skutterudite system', Journal of Applied Physics, vol. 79, no. 11, pp. 8412-8418.
Tritt TM, Nolas GS, Slack GA, Ehrlich AC, Gillespie DJ, Cohn J. Low-temperature transport properties of the filled and unfilled IrSb3 skutterudite system. Journal of Applied Physics. 1996 Jun 1;79(11):8412-8418.
Tritt, Terry M. ; Nolas, G. S. ; Slack, G. A. ; Ehrlich, A. C. ; Gillespie, D. J. ; Cohn, Joshua. / Low-temperature transport properties of the filled and unfilled IrSb3 skutterudite system. In: Journal of Applied Physics. 1996 ; Vol. 79, No. 11. pp. 8412-8418.
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