Radioisotope Systems for Defense Applications [multiservice

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Low Temperature (Bismuth Telluride) junction. TES is major source and user for DOE and commeccial thermoelectric metalized module contacting process superior to soldering or other techniques temperature reasons. 2. Medium Temperature materials (Germanium and Lead Telluride family) approximately IO009F hot junction. TES is leader and specializes in these m_terials for terrestrial RTGs. They are also preferred for planetary atmosphere applications such as Mars. 3. High Temperature materials (1800°F hot junction).

Figure of Merit (Z) 2 Z _ = Pk Figure of merit efficiency. In T/E efficiency. 2. Seebeck (Seebeck coefficient) 2 resistivity x thermal electrical is an index or measure general, the higher Z Z has units of inverse conductivity of a material's is, the greater temperature. T/E the Effect Thomas Johann Seebeck discovered in 1821 that a junction of dissimilar metals upon which a temperature difference had been imposed produced a voltage from which an electric current could be delivered. 3. e. in French watchmaker, across in heat 1834, Jean discovered Charles that the the junction of two dissimilar absorption or liberation at the junction.

Funding for TES fraction of the terrestrial funding for high visibility and in of successful missions little attention given programs space RTG has been typically programs at GE. - Funding is normally user dollars with partial contract program management - typically 1/3 Thermoelectric There are available. Direct three Conversion developed DOE DOE, a funding for 2/3 User. Technology classes of thermoelectric materials I. Low Temperature (Bismuth Telluride) junction. TES is major source and user for DOE and commeccial thermoelectric metalized module contacting process superior to soldering or other techniques temperature reasons.