Abstract

Carboreduction of UO 3 has been studied by in situ infrared spectroscopy in order to detect the presence of carbon monoxide during the reduction. From thermogravimetry, the reaction was observed to occur in two steps: (i) reduction of UO 3 to U 3O 8 by carbon at 440°C and (ii) reduction at 590°C of U 3O 8 to UO 2 by carbon. No carbon monoxide was observed during the reaction. Nevertheless, formation of carbonate species is suggested at temperature above 550°C with absorption bands around 1005 and 1300 cm −1.

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