water content of the uo 2 f 2 nh 2 o the products of the reaction have not been identified the method according to the invention is particularly advantageous in that it can be practiced at room temperature and with relatively low partial pressures of the substances employed and without the formation of explosive mixtures the following examples are given by way of illustration to further explain the principles of the invention these examples are merely illustrative and are not to be understood as limiting the scope and underlying principles of the invention in any way all percentages referred to herein are by weight unless otherwise indicated 3 2 g of anhydrous uo 2 f 2 were placed at the bottom of a 15 liter stainless steel reaction vessel equipped with a sapphire observation window the reaction vessel was charged at room temperatures with 50 mbar of gaseous bbr 3 after about six hours the uranium containing deposits present were colored a blackish brown and the remaining bbr 3 was pumped out of the vessel by introducing 130 mbar fluorine at room temperature the deposits were completely volatilized within one hour forming in addition to uf 6 and brf 5 smaller quantities of bf 3 an analogous experiment utilizing uranyl fluoride hydrate uo 2 f 2 0 7 1 2 h 2 o in place of the anhydrous fluoride did not produce satisfactory results no halogen exchange had taken place between bbr 3 and the uranyl fluoride hydrate 2 3 g uf 6 were hydrolyzed with steam in a 15 liter stainless steel reaction vessel equipped with a sapphire observation window the resulting fog of hydrolysis dust having the formula uo 2 f 2 0.