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Vanadium(III) oxide

Names
Other names Vanadium sesquioxide, Vanadic oxide
Identifiers
CAS Number	1314-34-7
3D model (JSmol)	Interactive image
ECHA InfoCard	100.013.847
PubChem CID	518710
RTECS number	YW3050000
UNII	Y469L16CWH
CompTox Dashboard (EPA)	DTXSID90892259
SMILES ....
Properties
Chemical formula	V2O3
Molar mass	149.881 g/mol
Appearance	Black powder
Density	4.87 g/cm
Melting point	1,940 °C (3,520 °F; 2,210 K)
Solubility in other solvents	Insoluble
Magnetic susceptibility (χ)	+1976.0·10 cm/mol
Structure
Crystal structure	Corundum, hR30
Space group	R3c (No. 167)
Lattice constant	a = 547 pmα = 53.74°, β = 90°, γ = 90°
Thermochemistry
Std molar entropy (S298)	98.07 J/mol·K
Std enthalpy of formation (ΔfH298)	-1218.800 kJ/mol
Gibbs free energy (ΔfG)	-1139.052 kJ/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Y verify (what is  ?) 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. It is a basic oxide dissolving in acids to give solutions of vanadium (III) complexes. V₂O₃ has the corundum structure. It is antiferromagnetic with a critical temperature of 160 K. At this temperature there is an abrupt change in conductivity from metallic to insulating. This also distorts the crystal structure to a monoclinic space group: C2/c.

Upon exposure to air it gradually converts into indigo-blue V₂O₄.

In nature it occurs as the rare mineral karelianite.

References

1. ^ Shvets, Petr; Dikaya, Olga; Maksimova, Ksenia; Goikhman, Alexander (2019-05-15). "A review of Raman spectroscopy of vanadium oxides". Journal of Raman Spectroscopy. 50 (8). Wiley: 1226–1244. Bibcode:2019JRSp...50.1226S. doi:10.1002/jrs.5616. ISSN 0377-0486. S2CID 182370875.
2. ^ 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.
3. Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 1. p. 1267.
4. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
5. ^ E.M. Page, S.A.Wass (1994),Vanadium:Inorganic and Coordination chemistry, Encyclopedia of Inorganic Chemistry, John Wiley & Sons, ISBN 0-471-93620-0
6. "Karelianite". www.mindat.org.

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