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In earlier times, uranium dioxide was also used as heat conductor for current limitation (URDOX-resistor), which was the first use of its semiconductor properties. [citation needed] Uranium dioxide displays strong piezomagnetism in the antiferromagnetic state, observed at cryogenic temperatures below 30 kelvins.
This is an extended version of the energy density table from the main Energy density page: Energy densities table ... Uranium-235 fissile isotope: 144,000,000 [1 ...
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.
The most important oxidation states of uranium are uranium(IV) and uranium(VI), and their two corresponding oxides are, respectively, uranium dioxide (UO 2) and uranium trioxide (UO 3). [2] Other uranium oxides such as uranium monoxide (UO), diuranium pentoxide (U 2 O 5), and uranium peroxide (UO 4 ·2H 2 O) also exist.
Triuranium octoxide is (depending on conditions) the most stable compound of uranium and is the form most commonly found in nature. Uranium dioxide is the form in which uranium is most commonly used as a nuclear reactor fuel. [104] At ambient temperatures, UO 2 will gradually convert to U 3 O 8. Because of their stability, uranium oxides are ...
The compounds identified in yellowcakes include uranyl hydroxide, uranyl sulfate, sodium para-uranate, and uranyl peroxide, along with various uranium oxides. Modern yellowcake typically contains 70% to 90% triuranium octoxide (U 3 O 8) by weight. Other oxides such as uranium dioxide (UO 2) and uranium trioxide (UO 3) exist. [4]
The bulk density of UF 4 varies from about 2.0 g/cm 3 to about 4.5 g/cm 3 depending on the production process and the properties of the starting uranium compounds. A molten salt reactor design, a type of nuclear reactor where the working fluid is a molten salt, would use UF 4 as the core material.
Because the melting point of uranium dioxide is about 3300 K, it is clear that uranium oxide fuel is overheating at the center. Temperature profile for a 20 mm diameter fuel pellet with a power density of 1000 W per cubic meter.