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.
This is a preview of subscription content, access via your institution.
Buy single article
Instant access to the full article PDF.
Tax calculation will be finalised during checkout.
F. J. DiSalvo, Science, 285, 703–6 (1999).
D. Y. Chung, T. Hogan, P. Brazis, M. Rocci-Lane, C. Kannewurf, M. Bastea, C. Uher, and M. G. Kanatzidis, Science, 287, 1024-7 (2000.)
T. M. Tritt, Science, 283, 804–5 (1999).
New Materials and Performance Limits for Thermoelectric Cooling, G. A. Slack, in CRC Handbook of Thermoelectrics, Rowe ed. p 407-4 (1995).
R. T. Littleton, J. W. Kolis, C. R. Feger and T.M. Tritt, MRS 1998: Thermoelectric Materials 1998. edited by T. M. Tritt et. al. Vol. 545, p 381–396 (1998).
R. T. Littleton, T. M. Tritt, C. R. Feger, J. Kolis, M. L. Wilson, M. Marone, J. Payne, D. Verebeli, and F. Levy, Appl. Phys. Lett., 72, 2056-8 (1998).
R. T. Littleton, T. M. Tritt, J. W. Kolis, and D. Ketchum, Phys. Rev. B., 60, 13453–7 (1999).
T. M. Tritt, N. D. Lowhorn, R. T. Littleton, A. Pope, C. R. Feger, and J. W. Kolis, Phys. Rev. B., 60, 7816–9 (1999).
F. Levy and H. Berger, J. Cryst. Growth, 61, 61–8 (1983).
S. Furuseth, L. Brattas, and A. Kjekshus, Acta. Chem. Scand., 27, 2367–2374 (1973).
B. Zawilski, R. T. Littleton, and T. M. Tritt, Rev. Sci. Instrum., in progress (2000).
B. Zawilski, R. T. Littleton, and T. M. Tritt, MRS, this proceeding, (2000).
About this article
Cite this article
Littleton, R.T., Tritt, T.M., Zawilski, B. et al. Thermoelectric Figure of Merit, ZT, of Single Crystal Pentatellurides (MTe5-XSex: M = Hf, Zr and x = 0, 0.25). MRS Online Proceedings Library 626, 31 (2000). https://doi.org/10.1557/PROC-626-Z3.1