Vanadium(III) oxide
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| Template:Longitem | V2O3 |
| Molar mass | 149.881 g/mol |
| Appearance | Black powder |
| Density | 4.87 g/cm3 |
| Melting point | Template:Chembox CalcTemperatures |
| Solubility in other solvents | Insoluble |
| Template:Longitem | +1976.0·10−6 cm3/mol |
| Template:Longitem | Corundum, hR30 |
| Template:Longitem | R3c (No. 167) |
| Template:Longitem | a = 547 pm α = 53.74°, β = 90°, γ = 90°
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| Template:Longitem | 98.07 J/mol·K [1] |
| Template:Longitem | −1218.800 kJ/mol [1] |
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Vanadium(III) oxide is the inorganic compound with the formula V2O3. It is a black solid prepared by reduction of V2O5 with hydrogen or carbon monoxide.[2][3] It is a basic oxide dissolving in acids to give solutions of vanadium (III) complexes.[3] V2O3 has the corundum structure.[3] It is antiferromagnetic with a critical temperature of 160 K, below which there is an abrupt change in conductivity from metallic to insulating.[4] This also distorts the crystal structure to a monoclinic space group: C2/c.[5]
Upon exposure to air it gradually converts into indigo-blue V2O4.[4]
In nature it occurs as the rare mineral karelianite.[6]
References
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- ↑ a b c R. Robie, B. Hemingway, and J. Fisher, “Thermodynamic Properties of Minerals and Related Substances at 298.15K and 1bar Pressure and at Higher Temperatures,” US Geol. Surv., vol. 1452, 1978.[1]
- ↑ Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 1. p. 1267.
- ↑ a b c Script error: No such module "citation/CS1".
- ↑ a b E.M. Page, S.A.Wass (1994),Vanadium:Inorganic and Coordination chemistry, Encyclopedia of Inorganic Chemistry, John Wiley & Sons, Template:ISBN
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