Niobium monoxide

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Niobium monoxide
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Names
Other names
niobium(II) oxide, columbium monoxide
Identifiers
12034-57-0 YesY
ChemSpider 74751 YesY
Jmol 3D model Interactive image
PubChem 82838
  • InChI=1S/Nb.O YesY
    Key: BFRGSJVXBIWTCF-UHFFFAOYSA-N YesY
  • O=[Nb]
Properties
NbO
Molar mass 108.906 g/mol
Appearance grey solid
Density 7.3 gcm3
Melting point 1,940 °C (3,520 °F; 2,210 K)
Vapor pressure {{{value}}}
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Niobium monoxide

Niobium monoxide, is the inorganic compound with the formula NbO. It is a grey solid with metallic conductivity.[1]

Structure and electronic properties

It adopts an unusual structure, being cubic as is rock salt structure, but where both niobium and oxygen atoms are four coordinate square planar.[1] The niobium centers are arranged in octahedra, and there is a structural similarity to the octahedral niobium clusters in lower halides of niobium.[1] In NbO the Nb-Nb bond length is 298 pm which compares to 285 pm in the metal.[1] One study of the bonding concludes that strong and nearly covalent bonds exist between the metal centers.[2]

It is a superconductor at 1.38 K.[3] It is used in capacitors where a layer of Nb2O5 is formed around NbO grains as the dielectric.[4][5][6]

Preparation

NbO can be prepared by reduction of Nb2O5 by H2[1] More typically, it is prepared by comproportionation:[7]

Nb2O5 + 3 Nb → 5 NbO

References

  1. 1.0 1.1 1.2 1.3 1.4 Lua error in package.lua at line 80: module 'strict' not found.
  2. Electronic band structure and bonding in Nb3O3, Physical Review B (Condensed Matter), 48, 23, 1993, 16986-16991 doi:10.1103/PhysRevB.48.16986
  3. Superconductivity In the TiO and NbO systems, Hulm, J. K.; Jones, C. K.; Hein, R. A.; Gibson, J. W., Journal of Low Temperature Physics, 7, 3-4, 291-307, doi:10.1007/BF<sub>00660068</sub>
  4. C. Nico et al. Sintered NbO powders for electronic device applications The Journal of Physical Chemistry C 2011, Volume 115(11), Pages: 4879–4886 doi:10.1021/jp110672u
  5. C. Nico et al. NbO/Nb2O5 core–shells by thermal oxidation Journal of the European Ceramic Society 2013, Volume 33(15-16), Pages: 3077–3083 doi:10.1016/j.jeurceramsoc.2013.06.020
  6. Kazumi Naito, Isao Kabe,(Showa Denko K.K.) Production method of solid electrolytic capacitor US patent 6882522(2005)
  7. T. B. Reed, E. R. Pollard "Niobium Monoxide" Inorg. Syn. 1995, vol. 30, pp. 108–110. doi:10.1002/9780470132616.ch22