Vanadium sesquioxide, Vanadic oxide
3D model (JSmol)
CompTox Dashboard (EPA)
|Molar mass||149.881 g/mol|
|Melting point||1,940 °C (3,520 °F; 2,210 K)|
|Solubility in other solvents||Insoluble|
|R3c (No. 167)|
a = 547 pm
α = 53.74°, β = 90°, γ = 90°
|98.07 J/mol·K |
Std enthalpy of
|-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 [77 °F], 100 kPa).
(what is ?)
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.