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This report presents a summary of compatibility tests conducted to date between production grade ^^^PuOg and platinum and platinum-rhodium alloys. Test periods were as long as 360 days, and most of the work was done at 800, 1000, and 1200°C. Samples were analyzed by means of metallography, mlcrohardness measurements, x-ray diffraction, and electron microprobe analysis. A chronology of the program to date is presented along with a discussion of the various results. The effects of impurities in the fuel, the presence of molybdenum or tantalum in the system, as well as the effects of a reducing atmosphere are presented and discussed. Attempts are made to interpret the results in terms of possible mechanisms .

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L E G A L N O T I C E This report was prepared as an account of work sponsored by the United States Government. Neither the United States nor the United States Atomic EnergyCommission, nor any of their employees, nor any of their contractors, subcontractors, or their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness or usefulness of any information, apparatus, product or process disclosed, or represents that its use would not infringe privately owned rights. MONSANTO RESEARCH CORPORATION