Other
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aipc..420.1634d&link_type=abstract
Space technology and applications international forum - 1998. AIP Conference Proceedings, Volume 420, pp. 1634-1640 (1998).
Other
Thermoelectric And Thermomagnetic Effects, Thermoelectric, Electrogasdynamic And Other Direct Energy Conversion
Scientific paper
Thermoelectric conversion (TEC) presents several advantages compared to the other energy conversion technology: they are reliable, can operate untainted in hostile environments, and are also environmentally friendly. However their application has been limited up to now because of the relatively low conversion efficiency of traditional thermoelectric materials used in the devices. New more efficient materials are needed. The value of a material for thermoelectric power generation is defined by the thermoelectric figure of merit Z which is a function of the Seebeck coefficient S, electrical resistivity ρ and thermal conductivity k and is defined as Z=S2/ρk. The most physical-chemical and especially, kinetic properties are determined not only by chemical composition of the material, but also by the specific structure of a sample made of this material. The necessity to fulfill the indicated above requirements should be taken into account both on the stage of material preparation and in the stage of leg of the thermoelectric battery formations on its base. A choice of the optimal technique for the leg formations from synthesized thermoelectric materials, which are capable to provide the leg required forms and leg geometrical sizes, are determined by mechanical properties. Several methods for a thermoelectric efficiency increase that have been put forward over the past years. Among them we wish to focus our attention to produce segment thermoelectric leg with variation of the composition along legs. Calculated efficiency in this case is more than 10% (Th=775 K, Tc=325 K). The first experimental results on 2-stage composite leg indicate that high efficiency in the thermoelectric energy conversion. Crystal-growth techniques with high crystalline perfection stimulates us to use this method for preparation the thermoelectric generator material.
Dashevsky Zinovi
Drabkin Igor
Korotaev Vladimir
Rabinovich Dimir
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