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. 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.
| Names | |
|---|---|
| Other names
Vanadium sesquioxide, Vanadic oxide | |
| Identifiers | |
3D model (JSmol) |
|
| ECHA InfoCard | 100.013.847 |
PubChem CID |
|
| RTECS number |
|
| UNII | |
CompTox Dashboard (EPA) |
|
| |
| 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 | |
Std molar entropy (S⦵298) |
98.07 J/mol·K |
Std enthalpy of formation (ΔfH⦵298) |
-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).
Infobox references | |
Upon exposure to air it gradually converts into indigo-blue V2O4.
In nature it occurs as the rare mineral karelianite.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.