Vanadium(III) oxide

Vanadium(III) oxide
Names
Other names
Vanadium sesquioxide, Vanadic oxide
Identifiers
3D model (JSmol)
ECHA InfoCard 100.013.847
RTECS number
  • YW3050000
UNII
  • [O-2].[V+3].[O-2].[V+3].[O-2]
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
Corundum, hR30
R3c (No. 167)
a = 547 pm
α = 53.74°, β = 90°, γ = 90°
Thermochemistry
98.07 J/mol·K
−1218.800 kJ/mol
−1139.052 kJ/mol
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. 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, below which 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.

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