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Substitutional Effects on the Thermoelectric Properties of Transition Metal Pentatellurides

Published online by Cambridge University Press:  10 February 2011

R. T. Littleton ,
J. W. Kolis ,
C. R. Feger  and
Terry M. Tritt
R. T. Littleton
Affiliation:
Materials Science and Engineering Department
J. W. Kolis
Affiliation:
Materials Science and Engineering Department Department of Chemistry
C. R. Feger
Affiliation:
Department of Chemistry
Terry M. Tritt
Affiliation:
Materials Science and Engineering Department Department of Physics and Astronomy Clemson University, Clemson, SC 29634 USA
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Abstract

The thermoelectric properties (resistivity and thermopower) of single crystals of the low-dimensional pentatelluride materials, Hffe5 and ZrTe5, have been measured as a function of temperature from 10K < T < 320K. Both parent materials exhibit a resistive transition peak, Tp ≈ 80K for HfTe5 and Tp ≈ 145K for ZrTe5. Each display a large positive (p-type) thermopower (α ≥ +125μV/K) around room temperature, which undergoes a change to a large negative (n-type) thermopower (α≤-125μV/K) below the peak temperature. The magnitude of this resistive anomaly is typically 3–7 times the room temperature value of ≈ 1 mΩ•cm. Through isoelectronic substitution of Zr for Hf (Hf1-xZrxTe5), a systematic shift is observed in Tp as the Zr concentration increases. Small Ti substitution for Hf and Zr affects the electronic properties strongly, producing a substantial reduction in Tp for either parent compound. However, the large values of thermopower and the magnitude of the resistive peak remain essentially unchanged. Substitutions of Se or Sb on the Te sites greatly affects the electronic behavior of the parent materials. Se doping increases the thermopower values by ≈20% while decreasing the resistivity by as much as 25%. These effects double the power factor, α2σT, of the parent materials. Small Sb substitutions appear to completely suppress the resistive anomaly. These features in the resistivity and thermopower signal a large degree of tunability in the temperature range of operation. The potential of these materials as candidates for low temperature thermoelectric applications will be discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 545: Symposium Z – Thermoelectric Materials 1998 - The Next Generation… , 1998 , 381
Copyright
Copyright © Materials Research Society 1999

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