Niobium oxide explained

Niobium oxide, archaically called columbium oxide,^[1] 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 Nb_3n+1O_8n−2 where n ranges from 5 - 8 inclusive, e.g. Nb₈O₁₉ (Nb₁₆O₃₈).
• Nb₁₂O₂₉ and Nb₄₇O₁₁₆

Natural niobium oxide is sometimes known as niobia.

Notes and References

1. Kamat . G. R. . Gupta . C. K. . Oct 1971 . Open aluminothermic reduction of columbium (Nb) pentoxide and purification of the reduced metal . Metallurgical Transactions . en . 2 . 10 . 2817–2823 . 10.1007/BF02813257 . 0026-086X.