Vanadium(III) oxide

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]

Vanadium(III) oxide
Names
Other names
Vanadium sesquioxide, Vanadic oxide
Identifiers
ECHA InfoCard 100.013.847
RTECS number
  • YW3050000
UNII
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
98.07 J/mol·K [1]
Std enthalpy of
formation (ΔfH⦵298)
 -1218.800 kJ/mol [1]
-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).
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Infobox references

Upon exposure to air it gradually converts into indigo-blue V2O4.[4]

In nature it occurs as the rare mineral karelianite.[5]

References
  1. 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.
  2. Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 1. p. 1267.
  3. Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
  4. E.M. Page, S.A.Wass (1994),Vanadium:Inorganic and Coordination chemistry, Encyclopedia of Inorganic Chemistry, John Wiley & Sons, ISBN 0-471-93620-0
  5. http://www.mindat.org/min-2158.html
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