Uranium oxide

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)

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

[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. Archived January 18, 2013, at the Wayback Machine
[3]
Geoffrey Brooks (1992). Hitler's Nuclear Weapons. Pen and Sword. p. 40. ISBN 9780850523447.

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Preparation 38