Abstract
MILLER and co-workers1 for the first time isolated uranyl carbonate, prepared by the action of carbon dioxide under pressure on uranium trioxide, ammonium and sodium uranates. A different process was followed by Chernyaev and co-workers2, who prepared the compound by the treatment of aqueous and alcoholic solutions of uranyl nitrate with carbon dioxide under pressure or aqueous suspensions of uranium oxide, UO3, under normal conditions. A simple and convenient method has been developed by us for the preparation of the compound. The hitherto unreported compound uranium (IV) oxycarbonate, the preparation of which is described below, on exposure to dry air undergoes simultaneous oxidation and dehydration, resulting in the formation of the compound UO2CO3, 2.5 H2O, the progress of the oxidation being indicated by the gradual change of colour from dark green to bright yellow. This hydrated uranyl carbonate, when heated in vacuo at 160°, gives the anhydrous compound UO2CO3, which is stable up to 500° C.
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Miller, P. D., Pray, H. A., and Munger, H. P., Rep. A.E.C.D. (1949).
Chernyaev, I. I., Golovnya, V. A., and Ellert, G. V., Zhur. Neorg. Khim., 1, 35, 2726 (1956).
Sahoo, B., and Patnaik, D., Curr. Sci. (in the press).
Sahoo, B., and Patnaik, D., Curr. Sci. (in the press).
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SAHOO, B., PATNAIK, D. Carbonates of Uranium. Nature 185, 683 (1960). https://doi.org/10.1038/185683a0
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DOI: https://doi.org/10.1038/185683a0
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