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IMPROVED COMPATIBLE MATERIALS FO THERMOELECTRIC POWER GENERATION

The development of Improved PbTe alloys for thermoelectric power generation is based on the RCA innovation that dilute alloys have thermoelectric properties superior to those of more concentrated alloys. RCA demonstrated the success of this principle in the PbTe-GeTe alloy system. Accordingly, the first two major goals for the first six-month period were: (1) to determine the optimum alloy composition and doping impurity concentration for n-type PbTe-GeTe alloys (Milestone I), and (2) to establish hot-pressing techniques for preparing the optimum n-type composition with suitable properties for use in thermoelements (Milestone II). Beyond the six-month period, the third major goal was the development of a p-type PbTe alloy with thermoelectric properties significantly superior to commercial p-type material (Milestone III). Since device application of a thermoelectric material requires that it be strong and stable, mechanical strength measurements and extended life tests have been an integral part of this program. Technical details of the work accomplished are summarized below separately for n-type and p-type alloys.