Vanadium(III) oxide
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| Vanadium(III) oxide | |
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Other names
Vanadium sesquioxide, Vanadic oxide |
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| Identifiers | |
| CAS number | 1314-34-7  |
| PubChem | 518710 |
| RTECS number | YW3050000 |
| Properties | |
| Molecular formula | V2O3 |
| Molar mass | 149.881 g/mol |
| Appearance | Black powder |
| Density | 4.87 g/cm3 |
| Melting point |
1940 °C |
| Solubility in other solvents | Insoluble |
| Structure | |
| Crystal structure | Trigonal (karelianite), hR30 |
| Space group | R-3c h, No. 167 |
 (verify) (what is:  / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
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| Infobox references | |
Vanadium trioxide is the chemical compound V2O3. It is prepared by reduction of V2O5 with hydrogen or carbon monoxide.[1]It is a basic oxide dissolving in acids to give reducing vanadium(III) solutions.[1] V2O3 has the corundum structure.[1] It is antiferromagnetic with a critical temperature of 160 K. [2] At this temperature there is an abrupt change in conductivity from metallic to insulating.[2]
On exposure to air it is gradually converted into indigo-blue crystals of V2O4.[2] Vanadium trioxide is generally used as a catalyst when making ethanol from ethylene.[citation needed]
In nature it occurs only rarely, as the mineral karelianite.
[edit] References
- ^ a b c Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Oxford: Butterworth-Heinemann. ISBN 0080379419.
- ^ a b c E.M. Page, S.A.Wass (1994),Vanadium:Inorganic and Coordination chemistry, Encyclopedia of Inorganic Chemistry, John Wiley & Sons, ISBN 0-471-93620-0
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