Niobium monoxide
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| Niobium monoxide | |
|---|---|
| Other names | niobium(II) oxide, columbium monoxide |
| Identifiers | |
| CAS number | [12034-57-0] |
| Properties | |
| Molar mass | 108.906 g/mol |
| Appearance | grey solid |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
|
[edit] 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 is 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 is the dielectric.[4]
NbO can be prepared by reduction of Nb2O5 by H2[1]
[edit] References
- ^ a b c d e Greenwood, N. N.; Earnshaw, A. (1997). Chemistry of the Elements, 2nd Edition, Oxford:Butterworth-Heinemann. ISBN 0-7506-3365-4.
- ^ Electronic band structure and bonding in Nb3O3, Physical Review B (Condensed Matter), 48, 23, 1993, 16986-16991 doi:10.1103/PhysRevB.48.16986
- ^ 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/BF00660068
- ^ Kazumi Naito, Isao Kabe,(Showa Denko K.K.) Production method of solid electrolytic capacitor US patent 6882522(2005)
