Niobium dioxide
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| Template:Longitem | NbO2 |
| Molar mass | 124.91 g/mol |
| Appearance | bluish black solid |
| Melting point | Template:Chembox CalcTemperatures |
| Template:Longitem | Tetragonal, tI96 |
| Template:Longitem | I41/a, No. 88 |
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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
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
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- ↑ a b c Cite error: Script error: No such module "Namespace detect".Script error: No such module "Namespace detect".
- ↑ Pradyot Patnaik (2002), Handbook of Inorganic Chemicals,McGraw-Hill Professional, Template:ISBN
- ↑ Wells A.F. (1984) Structural Inorganic Chemistry 5th edition Oxford Science Publications Template:ISBN
- ↑ Script error: No such module "Citation/CS1".
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- ↑ Patent EP1524252, Sintered bodies based on niobium suboxide, Schnitter C, Wötting G
- ↑ 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.)
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