Nomenclature
CAS number: 1313-96-8
Niobium oxide (Nb
2O
5); columbium pentoxide; niobium(V) oxide.
Nb
2O
5; mol wt 265.81.
Nb 69.90%, O 30.10%.
Description and references
Separation: Münchow, Chem. Ztg. 84, 490, 527 (1960). Review of
polymorphism: Sch"afer et al., Angew. Chem. Int. Ed. 5, 40-52 (1966).
Properties
White, orthorhombic crystals. Becomes yellow
on heating. d 4.6.
mp 1520°. Insol
in water; sol in HF, hot H2SO4.