Jump to content

Niobium dioxide

From Wikipedia, the free encyclopedia
(Redirected from NbO2)
Niobium dioxide
Names
IUPAC name
niobium(IV) oxide, niobium dioxide
Other names
niobium(IV) oxide, columbium dioxide
Identifiers
3D model (JSmol)
ECHA InfoCard 100.031.632 Edit this at Wikidata
EC Number
  • 234-809-7
  • InChI=1S/Nb.2O
  • O=[Nb]=O
Properties
NbO2
Molar mass 124.91 g/mol
Appearance bluish black solid
Melting point 1,915 °C (3,479 °F; 2,188 K)[1]
Structure
Tetragonal, tI96
I41/a, No. 88
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)

Niobium dioxide, is the chemical compound with the formula NbO2. It is a bluish-black non-stoichiometric solid with a composition range of NbO1.94-NbO2.09.[1] It can be prepared by reducing Nb2O5 with H2 at 800–1350 °C.[1] An alternative method is reaction of Nb2O5 with Nb powder at 1100 °C.[2]

Properties

[edit]

The room temperature form of NbO2 has a tetragonal, rutile-like structure with short Nb-Nb distances, indicating Nb-Nb bonding.[3] The high temperature form also has a rutile-like structure with short Nb-Nb distances.[4] Two high-pressure phases have been reported: one with a rutile-like structure (again, with short Nb-Nb distances); and a higher pressure with baddeleyite-related structure.[5]

NbO2 is insoluble in water and is a powerful reducing agent, reducing carbon dioxide to carbon and sulfur dioxide to sulfur.[1] In an industrial process for the production of niobium metal, NbO2 is produced as an intermediate, by the hydrogen reduction of Nb2O5.[6] The NbO2 is subsequently reacted with magnesium vapor to produce niobium metal.[7]

References

[edit]
  1. ^ a b c d C. K. Gupta, A. K. Suri, S Gupta, K Gupta (1994), Extractive Metallurgy of Niobium, CRC Press, ISBN 0-8493-6071-4
  2. ^ Pradyot Patnaik (2002), Handbook of Inorganic Chemicals,McGraw-Hill Professional, ISBN 0-07-049439-8
  3. ^ Wells A.F. (1984) Structural Inorganic Chemistry 5th edition Oxford Science Publications ISBN 0-19-855370-6
  4. ^ Bolzan, A; Fong, Celesta; Kennedy, Brendan J.; Howard, Christopher J. (1994). "A Powder Neutron Diffraction Study of Semiconducting and Metallic Niobium Dioxide". Journal of Solid State Chemistry. 113 (1): 9–14. Bibcode:1994JSSCh.113....9B. doi:10.1006/jssc.1994.1334.
  5. ^ Haines, J.; Léger, J. M.; Pereira, A. S. (1999). "High-pressure structural phase transitions in semiconducting niobium dioxide". Physical Review B. 59 (21): 13650. Bibcode:1999PhRvB..5913650H. doi:10.1103/PhysRevB.59.13650. hdl:10183/198788.
  6. ^ Patent EP1524252, Sintered bodies based on niobium suboxide, Schnitter C, Wötting G
  7. ^ Method for producing tantalum/niobium metal powders by the reduction of their oxides by gaseous magnesium, US patent 6171363 (2001), Shekhter L.N., Tripp T.B., Lanin L.L. (H. C. Starck, Inc.)