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Uranium oxide information


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 (UO2, the mineral uraninite or pitchblende)
  • Diuranium pentoxide or uranium(V) oxide (U2O5)
  • Uranium trioxide or uranium(VI) oxide (UO3)
  • Triuranium octoxide (U3O8), the most stable uranium oxide; yellowcake typically contains 70 to 90 percent triuranium octoxide)
  • Uranyl peroxide (UO2O2 or UO4)
  • Amorphous uranium(VI) oxide (Am-U2O7)

Uranium dioxide is oxidized in contact with oxygen to form triuranium octoxide.

3 UO2 + O2 → U3O8; at 700 °C (970 K)

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