Vanadium(IV) oxide
Chemical compound / From Wikipedia, the free encyclopedia
Dear Wikiwand AI, let's keep it short by simply answering these key questions:
Can you list the top facts and stats about Vanadium(IV) oxide?
Summarize this article for a 10 year old
Vanadium(IV) oxide or vanadium dioxide is an inorganic compound with the formula VO2. It is a dark blue solid. Vanadium(IV) dioxide is amphoteric, dissolving in non-oxidising acids to give the blue vanadyl ion, [VO]2+ and in alkali to give the brown [V4O9]2− ion, or at high pH [VO4]4−.[4] VO2 has a phase transition very close to room temperature (~68 °C (341 K)).[5] Electrical resistivity, opacity, etc, can change up several orders. Owing to these properties, it has been used in surface coating,[6] sensors,[7] and imaging.[8] Potential applications include use in memory devices,[9][10] phase-change switches,[11] passive radiative cooling applications, such as smart windows and roofs, that cool or warm depending on temperature,[12][13][14] aerospace communication systems and neuromorphic computing.[15] It occurs in nature, as the mineral, Paramontroseite.
Names | |
---|---|
IUPAC name
Vanadium(IV) oxide | |
Other names
Vanadium dioxide Divanadium tetroxide | |
Identifiers | |
3D model (JSmol) |
|
ChEBI | |
ChemSpider | |
ECHA InfoCard | 100.031.661 |
EC Number |
|
873472 | |
PubChem CID |
|
CompTox Dashboard (EPA) |
|
| |
| |
Properties | |
VO2 | |
Molar mass | 82.94 g/mol |
Appearance | Blue-black powder |
Density | 4.571 g/cm3 (monoclinic) 4.653 g/cm3 (tetragonal) |
Melting point | 1,967 °C (2,240 K)[1] |
+99.0·10−6 cm3/mol[2] | |
Structure | |
Distorted rutile (<70 °C (343 K), monoclinic) Rutile (>70 °C (343 K), tetragonal) | |
Hazards | |
Occupational safety and health (OHS/OSH): | |
Main hazards |
toxic |
GHS labelling:[3] | |
Warning | |
H315, H319 | |
P264, P280, P302+P352, P305+P351+P338, P332+P313, P337+P313, P362 | |
NFPA 704 (fire diamond) | |
Flash point | Non-flammable |
Related compounds | |
Other anions |
Vanadium disulfide Vanadium diselenide Vanadium ditelluride |
Other cations |
Niobium(IV) oxide Tantalum(IV) oxide |
Vanadium(II) oxide Vanadium(III) oxide Vanadium(V) oxide | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|