Abstract
WE have found that fusion of uranium dioxide in an argon arc furnace at 2,800 ± 100° C., between a tungsten cathode and a water-cooled copper anode, consistently gave lustrous grey metallic-looking products, with the gross analytical composition UO2–x (0.15 > r > 0). The fused material was contaminated with less than 0.001 per cent of copper or tungsten. The extent to which the product was deficient in oxygen depended upon how long the sample had been held in the molten state, but the liquid seemed to approach a limiting composition, about UO1.86, after prolonged fusion. There was some vaporization from the melt, but the constitution of the vapour phase is unknown; after exposure to air, the powdery sublimate present in the furnace consisted of the oxygen-excess phase UO2+x..
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