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Uranium dioxide or uranium(IV) oxide (UO 2), 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. It is used in nuclear fuel rods in nuclear reactors. A mixture of uranium and plutonium dioxides is used as MOX fuel.
Yellowcake, a mixture of uranium oxides. Uranium oxide is an oxide of the element uranium. The metal uranium forms several oxides: Uranium dioxide or uranium(IV) oxide (UO 2, the mineral uraninite or pitchblende) Diuranium pentoxide or uranium(V) oxide (U 2 O 5) Uranium trioxide or uranium(VI) oxide (UO 3)
Uranium dioxide is the form in which uranium is most commonly used as a nuclear reactor fuel. [3] At ambient temperatures, UO 2 will gradually convert to U 3 O 8. Because of their stability, uranium oxides are generally considered the preferred chemical form for storage or disposal. [3]
Ammonium uranyl carbonate (UO 2 CO 3 ·2(NH 4) 2 CO 3) is known in the uranium processing industry as AUC [2] and is also called uranyl ammonium carbonate.This compound is important as a component in the conversion process of uranium hexafluoride (UF 6) to uranium dioxide (UO 2). [3]
According to the International Nuclear Safety Center [22] the thermal conductivity of uranium dioxide can be predicted under different conditions by a series of equations. The bulk density of the fuel can be related to the thermal conductivity. Where ρ is the bulk density of the fuel and ρ td is the theoretical density of the uranium dioxide.
No uranium oxyanion, such as [UO 4] 2− or [U 2 O 7] 2−, is known. Instead, all uranate structures are based on UO n polyhedra sharing oxygen atoms in an infinite lattice. [ 1 ] The structures of uranates(VI) are unlike the structure of any mixed oxide of elements other than actinide elements.
Uraninite, also known as pitchblende, is a radioactive, uranium-rich mineral and ore with a chemical composition that is largely UO 2 but because of oxidation typically contains variable proportions of U 3 O 8.
Uranium tetrafluoride is the inorganic compound with the formula UF 4. It is a green solid with an insignificant vapor pressure and low solubility in water . Uranium in its tetravalent ( uranous ) state is important in various technological processes.