Vanadium(III) oxide
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| Names | |
|---|---|
| Other names
Vanadium sesquioxide, Vanadic oxide
| |
| Identifiers | |
| ECHA InfoCard | 100.013.847 |
PubChem CID
|
|
| RTECS number | YW3050000 |
| Properties | |
| V2O3 | |
| Molar mass | 149.881 g/mol |
| Appearance | Black powder |
| Density | 4.87 g/cm3 |
| Melting point | 1,940 °C (3,520 °F; 2,210 K) |
| Solubility in other solvents | Insoluble |
| +1976.0·10−6 cm3/mol | |
| Structure | |
| Trigonal (karelianite), hR30 | |
| R-3c h, No. 167 | |
| Thermochemistry | |
Std molar
entropy (S |
98.07 J/mol·K [1] |
Std enthalpy of
formation (ΔfH |
-1218.800 kJ/mol [1] |
Gibbs free energy (ΔfG˚)
|
-1139.052 kJ/mol [1] |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
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. [4] At this temperature there is an abrupt change in conductivity from metallic to insulating.[4]
Upon exposure to air it gradually converts into indigo-blue V2O4.[4]
In nature it occurs as the rare mineral karelianite.[5]
References[edit]
- ^ 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 Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0-08-037941-9.
- ^ 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
- ^ http://www.mindat.org/min-2158.html
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