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Uranium oxide is anoxide of the elementuranium.

The metal uranium forms several oxides:

• Uranium dioxide or uranium(IV) oxide (UO₂, the mineraluraninite 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 isoxidized in contact withoxygen to form triuranium octoxide.

3 UO₂ + O₂ → U₃O₈ at 250 °C (523 K)

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

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