Vanadium(III) oxide

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Vanadium(III) oxide
Vanadium trioxide
Other names
Vanadium sesquioxide, Vanadic oxide
ECHA InfoCard 100.013.847
RTECS number YW3050000
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
Trigonal (karelianite), hR30
R-3c h, No. 167
98.07 J/mol·K [1]
-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

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]


  1. ^ 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]
  2. ^ Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 1. p. 1267.
  3. ^ a b c Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
  4. ^ 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
  5. ^