Berkelium(III) oxide is a binary inorganic compound of berkelium and oxygen with the chemical formula Bk2O3.

[1] Berkelium(III) oxide can be prepared from berkelium(IV) oxide by reduction with hydrogen:[2] The compound forms a yellow-green solid with a melting point of 1920 °C.

It forms a body-centered cubic crystal lattice with a = 1088.0 ± 0.5 pm.

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