Niobium oxide

Niobium oxide, archaically called columbium oxide, may refer to:


 * Niobium monoxide (niobium(II) oxide), NbO
 * Niobium dioxide (niobium(IV) oxide), NbO2
 * Niobium pentoxide (niobium(V) oxide), Nb2O5

In addition to the above, other distinct oxides exist
 * general formula Nb3n+1O8n−2 where n ranges from 5 - 8 inclusive, e.g. Nb8O19 (Nb16O38).
 * Nb12O29 and Nb47O116

Natural niobium oxide is sometimes known as niobia.