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Proceedings Paper

Temperature dependence of the properties of thermoelectric materials measured under steady-state isothermal conditions
Author(s): Jay R. Maddux; Patrick J. Taylor
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Paper Abstract

A simple technique with low thermal losses is used to characterize the temperature-dependent properties of some well-known thermoelectric (TE) materials. With this measurement technique, a radiant heat source is used to impose a small temperature gradient (ΔT) on a TE sample in an otherwise isothermal chamber. The Seebeck coefficient is determined directly from the linear relationship of the sample voltage with varying ΔT. To determine thermal conductivity, a small electrical current (I) is passed through the sample which causes Peltier cooling at the heated surface and can be used to force the sample toward an isothermal condition with its surroundings. At steady-state, the thermal conductivity is determined from the ΔT vs. I relationship. Because the sample is nearly isothermal with its surroundings, thermal parasitic losses are negligibly small and thermal conductivity can be determined with high accuracy.

Paper Details

Date Published: 28 May 2013
PDF: 6 pages
Proc. SPIE 8728, Energy Harvesting and Storage: Materials, Devices, and Applications IV, 87280N (28 May 2013); doi: 10.1117/12.1518456
Show Author Affiliations
Jay R. Maddux, General Technical Services (United States)
Patrick J. Taylor, U.S. Army Research Lab. (United States)

Published in SPIE Proceedings Vol. 8728:
Energy Harvesting and Storage: Materials, Devices, and Applications IV
Nibir K. Dhar; Palani Balaya; Achyut K. Dutta, Editor(s)

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