Uranium oxide

Short description: Oxide of the element uranium

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)

## Preparation 38

During World War II, "Preparation 38" was the codename for uranium oxide used by German scientists.[1][2][3]

## References

1. ↑ Per F. Dahl, Heavy water and the wartime race for nuclear energy (Institute of Physics Publishing, London 1999), p. 135
2. ↑ Uranium Oxide International Bio-Analytical Industries, Inc.
3. ↑ Geoffrey Brooks (1992). Hitler's Nuclear Weapons. Pen and Sword. p. 40. ISBN 9780850523447.

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