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Niobium monoxide
Other names niobium(II) oxide, columbium monoxide
CAS number 12034-57-0
Molecular formula NbO
Molar mass 108.906 g/mol
Appearance grey solid
Density 7.3 gcm3
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Niobium monoxide

Niobium monoxide, is the chemical compound with the formula NbO. It is a grey solid with metallic conductivity.[1] It has an unusual cubic crystal structure, related to the rock salt structure, where both niobium and oxygen atoms are four coordinate square planar.[1] The niobium atoms 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 there are strong and nearly covalent bonds between the metal atoms.[2]
It is a superconductor at 1.38 K.[3] It is used in capacitors where a layer of Nb2O5 deposited on it as the dielectric.[4]
NbO can be prepared by reduction of Nb2O5 by H2[1]


  1. ^ a b c d e Greenwood, Norman N.; Earnshaw, A. (1997), Chemistry of the Elements (2nd ed.), Oxford: Butterworth-Heinemann, ISBN 0-7506-3365-4  
  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. ^ Kazumi Naito, Isao Kabe,(Showa Denko K.K.) Production method of solid electrolytic capacitor US patent 6882522(2005)


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