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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.
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) Triuranium octoxide (U 3 O 8), the most stable uranium oxide; yellowcake ...
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.
One advantage is that uranium nitride has a better thermal conductivity than UO 2. Uranium nitride has a very high melting point. This fuel has the disadvantage that unless 15 N was used (in place of the more common 14 N), a large amount of 14 C would be generated from the nitrogen by the (n,p) reaction.
The Gmelin rare earths handbook lists 1522 °C and 1550 °C as two melting points given in the ... 92 U uranium; use: 1405.3 K: 1132.2 °C: 2070 °F WEL: 1405.3 K:
Melting point: 1405.3 ... Yellow glass with 1% uranium oxide was found in a Roman villa on Cape Posillipo in the Bay of Naples, Italy, ...
Melting point: 900 to 1,100 °C (1,650 to 2,010 °F; 1,170 to 1,370 K) (decomposes to UN) ... uranium oxide (UO 2), while also demonstrating lower release of fission ...
Uranium trioxide (UO 3), also called uranyl oxide, uranium(VI) oxide, and uranic oxide, is the hexavalent oxide of uranium. The solid may be obtained by heating uranyl nitrate to 400 °C. Its most commonly encountered polymorph is amorphous UO 3 .