Vanadium(IV) oxide
- CAS number
- 12036-21-4
- Molecular weight
- 82.94
- Molecular formula / chemical symbol
- VO2
Description
Vanadium(IV) oxide is the inorganic compound with the formula VO2. It is a dark blue solid. Vanadium(IV) oxide is amphoteric, dissolving in non-oxidising acids to give the vanadyl ion, [VO]2+ and in alkali to give the [V4O9]2? ion, or at high pH [VO4]4?.
Following the method described by Berzelius, VO2 is prepared by comproportionation of vanadium(III) oxide and vanadium(V) oxide:
V2O5 + V2O3 → 2 VO2
At room temperature VO2 has a distorted rutile structure with shorter distances between pairs of V atoms indicating metal-metal bonding. Above 68 °C the structure changes to an undistorted rutile structure and the metal-metal bonds are broken causing an increase in electrical conductivity and magnetic susceptibility as the bonding electrons are "released". The origin of this metal to insulator transition remains controversial and is of interest in condensed matter physics.
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Vanadium(IV) oxide |
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Vanadium(IV) oxide |
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Other names[hide]
Vanadium
dioxide |
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Identifiers |
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Properties |
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VO2 |
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82.94 g/mol |
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Appearance |
Deep Blue Powder |
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4.571 g/cm3 (monoclinic) |
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1,967 °C |
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Structure |
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Distorted rutile (<70 °C, monoclinic) |
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Hazards |
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EU Index |
Not listed |
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36/37/38 |
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26-36/37/39 |
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Non-flammable |
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Related compounds |
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Other anions |
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Other cations |
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USES
As a
glass, ceramic colorant.
Having
conductive properties of vanadium dioxide is allowed to having a wide range of
potential applications in optical devices, electronic devices and
optoelectronic devices.
Keywords:Fine ceramics
Report
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Product name |
CAS:12036-21-4 |
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Description |
Deep Blue Powder |
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Formula |
VO2 |
99% |
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TEST RESULTS |
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VO2 |
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