Copyright © 2020 Elsevier B.V. or its licensors or contributors. Prior to 1960, it was used as yellow and black color in ceramic glazes and glass. 2005-03-26. Uranium dioxide or uranium(IV) oxide (UO2), also known as urania or uranous oxide, is an oxide of uranium, and is a black, radioactive, crystalline powder that naturally occurs in the mineral uraninite. 2 Names and Identifiers Expand this section. Two of the constants in the equation are related to properties of the UO2lattice. Create . 4 Spectral Information Expand this section. Register to receive personalised research and resources by email, Smoothed Values of the Enthalpy and Heat Capacity of UO, Los Alamos Scientific Laboratory, Los Alamos, New Mexico 87544. More... Molecular Weight: 270.028 g/mol. By closing this message, you are consenting to our use of cookies. 3099067 The equation can be used to calculate enthalpy, and differentiated to obtain heat capacity in this temperature range. UO2enthalpy data measured by five different investigators were fitted to a theoretically based equation from room temperature to the melting point. It is used in nuclear fuel rods in nuclear reactors. Heat capacity values of UO2 and U1-xGd xO2 obtained in the present investigation are in good agreement with data recorded in the literature. UO2 enthalpy data measured by five different investigators were fitted to a theoretically based equation from room temperature to the melting point. A mixture of uranium and plutonium dioxides is used as MOX fuel. We use cookies to improve your website experience. Crossref. The equation can be used to calculate enthalpy, and differentiated to obtain heat capacity in this temperature range. Most of LWRs use the uranium fuel, which is in the form of uranium dioxide (chemically UO 2).Uranium dioxide is a black semiconducting solid with very low thermal conductivity. To learn about our use of cookies and how you can manage your cookie settings, please see our Cookie Policy. EINECS 215-700-3. dioxouranium. 2020-11-07. Keiji Naito, High-temperature heat capacities of UO2 and doped UO2, Journal of Nuclear Materials, 10.1016/0022-3115(89)90422-4, 167, (30-35), (1989). Uranium dioxide is a ceramic refractory uranium compound, in many cases used as a nuclear fuel. The effect of additions of 3 mass% and 5 mass% Gd 2 O 3 on the heat capacity (Cp) and enthalpy of urania for temperatures between 298 and 1800 K has been determined using differential-scanning calorimetry and drop calorimetry. Dates: Modify . Gittus, J.R. Matthews, P.E. Additions of Gd2O3 to UO2 appear to lower the temperature for the commencement of the upturn in the Cp(UO2)-temperature curve. By continuing you agree to the use of cookies. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. 5 Howick Place | London | SW1P 1WG. J.H. Two of the constants in the equation are related to properties of the UO2 lattice. Registered in England & Wales No. The effect of additions of 3 mass% and 5 mass% Gd2O3 on the heat capacity (Cp) and enthalpy of urania for temperatures between 298 and 1800 K has been determined using differential-scanning calorimetry and drop calorimetry. 1 Structures Expand this section. We use cookies to help provide and enhance our service and tailor content and ads. 3 Chemical and Physical Properties Expand this section. Uranium oxide (UO2) 1344-57-6. Contents. Estimated heat capacities for the gadolinium-doped samples were found to be within ± 3% of the measured values. 5 Related Records Expand this section. Copyright © 1989 Published by Elsevier B.V. https://doi.org/10.1016/0040-6031(89)87014-5.