Time changes in the thermal conductivity of silicon germanium thermoelectric material caused by alloying processes
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Engineering topics
Publications and source records attributed to De Winter, F..
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The outer planetary exploration missions studied by the Jet Propulsion Laboratory require silicon-germanium radioisotope thermoelectric generators (RTGs) in which the factors of safety are as low as is compatible with the reliable satisfaction of the power needs. Work on silicon germanium sublimation performed at the Jet Propulsion Laboratory is presented. Analytical modeling work on the solid-diffusion process involved in the steady-state (free) sublimation of silicon germanium is described. Analytical predictions are made of the sublimation suppression which can be achieved by using a cover gas. A series of accelerated (high-temperature) tests which were performed on simulated hardware (using four SiGe couples) to study long-term sublimation and reaction mechanisms are also discussed.
Protective xenon atmospheres in sealed silicon- germanium alloy thermoelectric generators, discussing leakage and pressure levels
Optimization of thermionic generator systems of high reliability