Uranium dioxide

Uranium dioxide
Names
IUPAC names
Uranium dioxide
Uranium(IV) oxide
Other names
Urania
Uranous oxide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.014.273 Edit this at Wikidata
EC Number
  • 215-700-3
RTECS number
  • YR4705000
UNII
  • InChI=1S/2O.U
    Key: FCTBKIHDJGHPPO-UHFFFAOYSA-N
  • O=[U]=O
Properties
UO2
Molar mass 270.03 g/mol
Appearance black powder
Density 10.97 g/cm3
Melting point 2,865 °C (5,189 °F; 3,138 K)
insoluble
Structure
Fluorite (cubic), cF12
Fm3m, No. 225
a = 547.1 pm [1]
Tetrahedral (O2−); cubic (UIV)
Thermochemistry
78 J·mol−1·K−1[2]
−1084 kJ·mol−1[2]
Hazards
GHS labelling:
GHS06: ToxicGHS08: Health hazardGHS09: Environmental hazard
Danger
H300, H330, H373, H410
P260, P264, P270, P271, P273, P284, P301+P310, P304+P340, P310, P314, P320, P321, P330, P391, P403+P233, P405, P501
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 4: Very short exposure could cause death or major residual injury. E.g. VX gasFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazard OX: Oxidizer. E.g. potassium perchlorate
4
0
0
OX
Flash point N/A
Safety data sheet (SDS) ICSC 1251
Related compounds
Other anions
 Uranium(IV) sulfide
Uranium(IV) selenide
Other cations
 Protactinium(IV) oxide
Neptunium(IV) oxide
Related uranium oxides
 Triuranium octoxide
Uranium trioxide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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. It is used in nuclear fuel rods in nuclear reactors. A mixture of uranium and plutonium dioxides is used as MOX fuel. Prior to 1960, it was used as yellow and black color in ceramic glazes and glass.

  1. ^ Leinders, Gregory; Cardinaels, Thomas; Binnemans, Koen; Verwerft, Marc (2015). "Accurate lattice parameter measurements of stoichiometric uranium dioxide". Journal of Nuclear Materials. 459: 135–42. Bibcode:2015JNuM..459..135L. doi:10.1016/j.jnucmat.2015.01.029. S2CID 97183844.
  2. ^ a b Zumdahl, Steven S. (2009). Chemical Principles 6th Ed. Houghton Mifflin Company. p. A23. ISBN 978-0-618-94690-7.