Niobium dioxide

Niobium dioxide
Names
	IUPAC name niobium(IV) oxide, niobium dioxide
	Other names niobium(IV) oxide, columbium dioxide
Identifiers
CAS Number	12034-59-2 ;
3D model (JSmol)	Interactive image;
ChemSpider	74752;
ECHA InfoCard	100.031.632
EC Number	234-809-7;
PubChem CID	82839;
CompTox Dashboard (EPA)	DTXSID90893180 ;
	InChI Key: HFLAMWCKUFHSAZ-UHFFFAOYSA-N; InChI=1S/Nb.2O;
	SMILES O=[Nb]=O;
Properties
Chemical formula	NbO2
Molar mass	124.91 g/mol
Appearance	bluish black solid
Melting point	1,915 °C (3,479 °F; 2,188 K)
Structure
Crystal structure	Tetragonal, tI96
Space group	I41/a, No. 88
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H315, H319, H335, H413
Precautionary statements	P261, P264, P264+P265, P271, P273, P280, P302+P352, P304+P340, P305+P351+P338, P319, P321, P332+P317, P337+P317, P362+P364, P403+P233, P405, P501
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Niobium dioxide, is the chemical compound with the formula NbO₂. It is a bluish-black non-stoichiometric solid with a composition range of NbO_1.94-NbO_2.09. It can be prepared by reducing Nb₂O₅ with H₂ at 800–1350 °C. An alternative method is reaction of Nb₂O₅ with Nb powder at 1100 °C.