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The Preparation and Properties of Uranium Trifluoride

Description: From abstract: "The means of preparing uranium trifluoride are discussed. The most practical method is the reduction of uranium tetrafluoride with uranium although reduction with hydrogen or atomic hydrogen may also be feasible...A literature survey and discussion of other means of preparation are given."
Date: 1949
Creator: Warf, James C.
Partner: UNT Libraries Government Documents Department

Freezing Point Diagram and Liquid-Liquid Solubilities of the System Uranium Hexafluoride-Hydrogen Fluoride

Description: Abstract: "The complete freezing point diagram for the system uranium hexafluoride-hydrogen fluoride has been determined. In addition, liquid-liquid solubilities of these compounds have been measured up to the consolute temperature of 101 C. A miscibility gap starts at 61.2 C. over the compositions range 10 to 80 mole per cent uranium hexafluoride. The lowest melting point of this binary system under its own pressure, i.e. the eutectic, is -85 C."
Date: December 28, 1952
Creator: Rutledge, Gene P.; Jarry, Roger L. & Davis, W., Jr.
Partner: UNT Libraries Government Documents Department

Identification of Reaction Products Formed During Magnesium Reduction of Uranium Tetrafluoride: Report

Description: Abstract: "This report describes the results of X-ray diffraction examination of reaction products from a series of experiments performed by Mallinckrodt Chemical Works as an acid in understanding the process of bomb reduction of UF4. UF4 is initially reduced to UF3 by magnesium at 560 C., and subsequently to metal at 600 C. MgF2 from the initial reaction forms a coating on the magnesium which retards the final spontaneous reaction."
Date: May 15, 1953
Creator: Schwartz, C. M. & Vaughan, D. A.
Partner: UNT Libraries Government Documents Department

Density and Refractive Index of Uranyl Fluoride Solutions

Description: "In the course of an ultracentrifugal investigation of uranyl fluoride solutions, their densities and refractive indices were measured as a function of concentration. The measurements were carried out near 25 and 30 C and if necessary extrapolated to 25.0 and 30.0 C from the observed temperature coefficients. Most density data were obtained pycnometrically (25 cc samples) and a few gradient tubes. The refractive index measurements were carried out with a Bausch and Lomb dipping refractometer (calibrated with "known" solutions) using sodium-D light. The materials used and the analytical procedures were described earlier. Although the accuracy of the density measurements was approximately one part in 10,000, the accuracy of the determinations at high UO2F2 concentration is considerably less, in view of the uncertainty in the uranium analyses."
Date: 1953
Creator: Johnson, James S. & Kraus, Kurt A.
Partner: UNT Libraries Government Documents Department

A Mill for the Quantitative Grinding of TF₄

Description: Abstract: "A monel metal rod mill has been designed, built, and tested for grinding five hundred gram batches of anhydrous tuballoy tetrafluoride to a fineness such that one hundred per cent will pass an eighty mesh screen; the grinding being accomplished without loss of material, and with the addition of less than two hundred parts per million of contaminating metals. The grinding time per batch is not more than fifty minutes."
Date: 1945
Creator: Webb, A. D.; Peed, W. F.; Pancoast, L. H. & Johnsson, Karl Otto
Partner: UNT Libraries Government Documents Department

Dissolution of Uranium Tetrafluoride

Description: "Five new dissolution processes for uranium tetrafluoride are discussed-the NH4OH-H2O2 method, the H2SC4 - (NH4)2S2O8 method, the AlCl3 method, the NaAlcl method, and the Al (NO3)3.9E2O method. It is concluded that NaAlCl4 and Al(NO3)3.9H2O are preferable to the other agents, especially with regard to rate of dissolution and ease of manipulation."
Date: 1949
Creator: Calkins, V. P. & Susano, C. D.
Partner: UNT Libraries Government Documents Department

Ultracentrifugal Measurements on Uranyl Fluoride Solutions

Description: Abstract: "Activity coefficient ratios for UO2F2 were measured at 30 C by ultracentrifugation to equilibrium. The method was checked with CdI2. The results for UO2F2 confirm the hypothesis of a monomer-diner equilibrium which was used previously to interpret the freezing point depressions of UO2F2 solutions. The dimerization constant at 30 C was found to be somewhat greater then at the freezing point. The proportionality constants for the dependence of the logarithm of the activity coefficients on molality were found to be essentially temperature independent. The heat and entropy of dimerization were estimated. Experiments in the presence of an indifferent electrolyte (NaClO4) support the assumption that dissociation into ions is slight. In potassium fluoride solutions, uranyl fluoride dimerizes more extensively than in water solutions."
Date: 1952
Creator: Johnson, James S. & Kraus, Kurt A.
Partner: UNT Libraries Government Documents Department

Analysis of uranium hexafluoride-hydrogen fluoride solutions by freezing point determination : errors caused by liquid -vapor equilibrium

Description: A report detailing the analysis of uranium hexafluoride-hydrogen fluoride solutions by their freezing point determination. This analysis was conducted by measuring vapor pressures at the freezing temperatures of different compositions of uranium hexafluoride-hydrogren fluoride solutions.
Date: 1955
Creator: Davis, W. & Kobisk, E. H.
Partner: UNT Libraries Government Documents Department

Spectrographic Determination of Vanadium in TF₄

Description: "In order to determine low concentrations of vanadium in TF₄ spectrographically, an investigation was conducted to ascertain conditions necessary for a reproducible procedure. The study was made to find a method of direct analysis of TF₄ to eliminate the time factor of any error introduced by the conversion of TF₄ to T₃O₈. All available methods of excitation were investigated."
Date: 1945
Creator: Chandler, Alfred B.; Burkhart, L. E. & Gates, J. W., Jr.
Partner: UNT Libraries Government Documents Department

The Determination of Total Non-U Cations in UF₄ by Penta-Ether Extraction

Description: "In consideration of the known high efficiency of penta-ether on the extraction of [Uranium] from aqueous solution without particularly affecting most other cations in the solution, it was felt that a TNU (total non-U cation) determination could be based upon the use of pents-ether to remove the U from non-U cations. After such separation, the non-U cations could then be determined in essentially the same manner as in the present TNU method (Method 50, CD-3801). The use of the penta-ether separation would have the advantage of reducing the amount of handling of the sample required in the present procedure and of reducing the time required to complete a TNU determination."
Date: 1946
Creator: Yellin, H. & Sinclair, E. E.
Partner: UNT Libraries Government Documents Department

Critical Ionization of Potentials of Uranium Hexafluoride

Description: Introduction: "The extensive use of uranium hexafluoride in the Nier-type mass spectrometers, where the ionization is produced by slow electrons, made a knowledge of the ionization potentials of the various ions desirable. This information was not available and work was accordingly begun to secure such data. The first measurement was made with a VGIA ion gauge and has been described in TEO report CD-310. With this apparatus it was not possible to identify the ionization products and it was presumed that the value reported was for the UF5 ion. When time and equipment became available, the work was continued and the critical potentials of the singly-charged ions determined."
Date: November 28, 1955
Creator: Cameron, Angus Ewan, 1906- & White, J. R.
Partner: UNT Libraries Government Documents Department

Corrosivity of Uranyl Fluoride to Certain Metals

Description: Abstract: "The results obtained from the tests conducted for the purpose of determining the corrosivity of a 30 percent-solution of uranyl fluoride to various metals indicate that stainless steels (type 302, 304, 321 and 316) have very good resistance; while monel, nickel and aluminum, respectively, exhibit diminishing resistance. Stainless steel, type 316, was the most resistant of the specimen tested."
Date: September 19, 1946
Creator: Little, L. F. & Susano, C. D.
Partner: UNT Libraries Government Documents Department

Volatilization of Molybdenum During the Preparation of TF₄ and T₃O₈ from TF₄

Description: This report follows the study that was undertaken in an attempt to show how one of the elements held over in appreciable amounts in TF4 after conversion with TO3, molybdenum, acts during this transformation. Also of interest is the behavior of molybdenum during the reaction TF4 --> T3O2.
Date: 1945
Creator: Wick, L. B.; Weaver, B. S. & Gates, J. W.
Partner: UNT Libraries Government Documents Department