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By Nathan W. Snyder

Power Conversion for house Power

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Q appears to have the maximum z in the range 900 to 1100 C. The properties of a sample of this composite are shown in Fig. 12. It was thought that the low temperature electrical properties might be dominated by the scattering of the electrons by cerium vacancies. Addition of SrS will fill these vacancies with Sr atoms (Ref. 28) and thus might be expected to improve the low temperature properties of the compounds. The compounds CeS.. (SrS) which has ~ 30$ of the Ce vacancies filled with Sr was prepared and the electron and thermal properties measured.

5 watt) (Ref. 2 watt/lb (lOO watt) (Ref. 31). The measured efficiency varies from 3-7$ (neglecting flue losses) (Ref. 31) to 5·5$ (radioisotope heated) (Ref. 29) or 7$ (Ref. 30). It is expected that 55 ENERGY CONVERSION FOR SPACE POWER both the efficiency and power per unit weight will increase in the near future. Nevertheless the actual efficiency is much lower than the maximum of 18$. There are several reasons for this. It might be thought that a generator with a finite number of stages would be appreciably less efficient than an infinite stage generator.

Yi - ι,γ6· Progress to date on these materials are discussed. The measurement of the thermal conductivity of Ce-S at high temperatures, usually very difficult to make, is made by a small-area-contact technique developed at General Atomic. INTRODUCTION The Ce-S and Th-S** semiconductor materials are being Presented at the ARS Space Power Systems Conference, Santa Monica, California, September 27-30; i960· Some of the work described in this paper was done under Bureau of Ships Contract NObs-771^· John Jay Hopkins Laboratory for Pure and Applied Science, General Atomic, Division of General Dynamics Corporation, San Diego, California.

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