Californium(IV) oxide

Californium(IV) oxide is a binary inorganic compound of californium and oxygen with the formula.

Synthesis
Californium dioxide is produced by oxidizing californium with molecular and atomic oxygen at high pressure.

Physical properties
Californium(IV) oxide is a black-brown solid that has a cubic fluorite crystal structure with a lattice parameter, the distance between unit cells in the crystal, of 531.0 ± 0.2 pm. Crystals of californium(III) oxide normally have a body-centered cubic symmetry. They convert to a monoclinic form upon heating to about 1400 °C and melt at 1750 °C.