Vanadium(III) oxide | |
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Other names
Vanadium sesquioxide, Vanadic oxide |
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Identifiers | |
CAS number | 1314-34-7 |
PubChem | 518710 |
RTECS number | YW3050000 |
Properties | |
Molecular formula | V2O3 |
Molar mass | 149.881 g/mol |
Appearance | Black powder |
Density | 4.87 g/cm3 |
Melting point |
1940 °C |
Solubility in other solvents | Insoluble |
Structure | |
Crystal structure | Trigonal (karelianite), hR30 |
Space group | R-3c h, No. 167 |
(verify) (what is: / ?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
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Infobox references |
Vanadium trioxide is the chemical compound V2O3. It is prepared by reduction of V2O5 with hydrogen or carbon monoxide.[1]It is a basic oxide dissolving in acids to give reducing vanadium(III) solutions.[1] V2O3 has the corundum structure.[1] It is antiferromagnetic with a critical temperature of 160 K. [2] At this temperature there is an abrupt change in conductivity from metallic to insulating.[2]
On exposure to air it is gradually converted into indigo-blue crystals of V2O4.[2] Vanadium trioxide is generally used as a catalyst when making ethanol from ethylene.
In nature it occurs only rarely, as the mineral karelianite.
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