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Thermoelectric Figure of Merit, ZT, of Single Crystal Pentatellurides (MTe5-XSex: M = Hf, Zr and x = 0, 0.25)

Published online by Cambridge University Press:  01 February 2011

R. T. Littleton IV
Affiliation:
Materials Science and Engineering Department, Clemson University, Clemson, SC 29634, USA
Terry M. Tritt
Affiliation:
Materials Science and Engineering Department, Clemson University, Clemson, SC 29634, USA Department of Physics and Astronomy, Clemson University, Clemson, SC 29634, USA
B. Zawilski
Affiliation:
Department of Physics and Astronomy, Clemson University, Clemson, SC 29634, USA
J. W. Kolis
Affiliation:
Materials Science and Engineering Department, Clemson University, Clemson, SC 29634, USA Department of Chemistry, Clemson University, Clemson, SC 29634, USA
D. R. Ketchum
Affiliation:
Department of Chemistry, Clemson University, Clemson, SC 29634, USA
M. Brooks Derrick
Affiliation:
Department of Chemistry, Clemson University, Clemson, SC 29634, USA
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Abstract

The thermoelectric figure of merit, ZT = α2σT/λ, has been measured for pentatelluride single crystals of HfTe5, ZrTe5, as well as Se substituted pentatellurides. The parent materials, HfTe5 and ZrTe5, exhibit relatively large p- and n- type thermopower, |a| > 125 μV/K, and low resistivity, ρ ≤ 1 mΩ•cm. These values lead to a large power factor (α2σT) which is substantially increased with proper Se substitution on the Te sites. The thermal conductivity of these needle-like crystals has also been measured as a function of temperature from 10 K ≤ T ≤ 300 K. The room temperature figure of merit for these materials varies from ZT “0.1 for the parent materials to ZT ≈ 0.25 for Se substituted samples. These results as well as experimental procedures will be presented and discussed.

Type
Research Article
Copyright
Copyright © Materials Research Society 2000

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References

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Thermoelectric Figure of Merit, ZT, of Single Crystal Pentatellurides (MTe5-XSex: M = Hf, Zr and x = 0, 0.25)
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