The tetrafluorides of uranium and plutonium form two hydrates, the higher one having 2-5 molecules of water per metal atom and the lower one 2.0 molecules of water or less. Methods for their formation have been investigated.The lower hydrate is pseudo-cubic, a = 5.69 kX for the uranium and 5.63 kX for the plutonium compound, and the proposed structure is similar to that of uranium dioxide, the water molecules occupying vacant uranium sites and being hydrogen-bonded to the fluorine. Very little change of cell dimension was observed over the range UF4,2H,0 to UF4,0.75H,0.The fluorination, at temperatures below loo", of the dioxides with gaseous hydrogen fluoride gives the lower fluoride hydrate and a second product which may be M(OH)F,,HF.
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