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Taylor, D.H.; Christie, W.H.; Pavone, D.
Du Pont de Nemours (E.I.) and Co., Aiken, SC (USA). Savannah River Lab.; Oak Ridge National Lab., TN (USA); Los Alamos National Lab., NM (USA)1984
Du Pont de Nemours (E.I.) and Co., Aiken, SC (USA). Savannah River Lab.; Oak Ridge National Lab., TN (USA); Los Alamos National Lab., NM (USA)1984
AbstractAbstract
[en] Plutonium oxide fuel pellets for powering radioisotopic thermoelectric generators for NASA space vehicles are encapsulated in iridium which has been grain-boundary-stabilized with thorium and aluminum. After aging for 6 months at 13100C under vacuum, enhanced grain growth is observed in the near-surface grains of the iridium next to the PuO2. Examination of the grain boundaries by AES and SIMS shows a depletion of thorium and aluminum. Iron, chromium, and nickel from the fuel were found to diffuse into the iridium along the grain boundaries. Enhanced grain growth appears to result from thorium depletion in the grain boundaries of the near-surface grains next to the fuel. However, in one instance grain growth was slowed by the formation of thorium oxide by oxygen diffusing up the grain boundaries
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1984; 25 p; 113. annual meeting of the American Institute of Mining, Metallurgical and Petroleum Engineers; Los Angeles, CA (USA); 26 Feb - 2 Mar 1984; CONF-840218--4; Available from NTIS, PC A02/MF A01; 1 as DE84008301
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Report
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Conference
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ACTINIDE COMPOUNDS, CHALCOGENIDES, CRYSTAL STRUCTURE, DIRECT ENERGY CONVERTERS, ELECTRON SPECTROSCOPY, ELEMENTS, EMISSION, ENERGY SOURCES, METALS, MICROSTRUCTURE, OXIDES, OXYGEN COMPOUNDS, PLATINUM METALS, PLUTONIUM COMPOUNDS, PLUTONIUM OXIDES, SPECTROSCOPY, TRANSITION ELEMENTS, TRANSURANIUM COMPOUNDS
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