Abstract
The sublimation of UCl 4 under argon and nitrogen is discussed. The former gave 99·42 per cent UCl 4 which yielded a stable solution free from colloid formation. The sublimation under nitrogen yielded a brownish-red material which had the combustibility and solubilities associated with the nitride but which was shown to be UO 2 by X-ray spectrum analysis. Both stabilities of the UCl 4 solutions and their analyses for uranium by the use of cupferron are discussed for both water and ethanol solvents. The preparation of pure UO 2Cl 2·H 2O is described, and the stability data for UO 2Cl 2 solutions in water, ethanol and water-ethanol solvents are presented. The cupferron method of separation of U(IV) and U(VI) was found to be as effective.
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