Thermomagnetic coolers based on Bi and Bi-Sb nanocomposites

Details Thermomagnetic coolers based on Bi and Bi-Sb nanocomposites Thermomagnetic coolers based on Bi and Bi-Sb nanocomposites

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..552.1113h&link_type=abstract

Space Technology and Applications International Forum - 2001. AIP Conference Proceedings, Volume 552, pp. 1113-1118 (2001).

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Direct Energy Conversion And Storage, Spaceborne And Space Research Instruments, Apparatus, And Components

Scientific paper

Bulk Bi, a semimetal, and Bi-Sb, have the highest thermoelectric figure of merit Z at 100 K. The thermoelectric properties of these materials are strongly anisotropic. The best thermoelectric performance is observed when the electrical current flows along the trigonal axis. However, Bi single crystals are easily cleaved along the trigonal planes. This lack of strength has largely prevented the use of these materials in practical thermoelectric coolers. Composite technology offers the opportunity to increase the toughness of Bi and Bi-Sb. Also, microengineering Bi into composites may lead to a significant improvement in their thermoelectric performance, because of the reduction of phonon conductivity from phonon scattering at the grain boundaries and interfaces. It has been shown theoretically that quantum-wire structures have the potential to significantly improve Z over the bulk value. We have synthesized microwire composites and present measurements of its electrical conductivity and Seebeck coefficient that are very encouraging. The role that a tough thermoelectric cooler could have in extending the lifetime of a space system such as Space InfraRed Telescope Facility (SIRTF) is briefly discussed. .

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