Vanadium (III) oxide

Crystal structure
__ V 3+      __ O 2−
General
Surname	Vanadium (III) oxide
other names	Vanadium trioxide Vanadium (III) oxide Divanadine trioxide
Ratio formula	V 2 O 3
Brief description	black, air-sensitive powder
External identifiers / databases
CAS number 1314-34-7 EC number 215-230-9 ECHA InfoCard 100,013,847 PubChem 518710 Wikidata Q425350
properties
Molar mass	149.88 g mol −1
Physical state	firmly
density	4.87 g cm −3
Melting point	1970 ° C
solubility	very bad in water (0.1 g l −1 at 20 ° C)
safety instructions
GHS labeling of hazardous substances Caution H and P phrases H: 319-332 P: 305 + 351 + 338
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Vanadium (III) oxide is a chemical compound from the group of oxides . It is in the form of a black powder.

Occurrence

Vanadium (III) oxide occurs naturally in the form of the rare mineral karelianite .

Extraction and presentation

Vanadium (III) oxide can be produced by reducing vanadium (V) oxide with hydrogen or carbon monoxide .

${\displaystyle \mathrm {V_{2}O_{5}+2\ H_{2}\longrightarrow V_{2}O_{3}+2\ H_{2}O} }$

properties

Vanadium (III) oxide is a matt black powder with a crystal structure of the corundum type ( aluminum oxide ) and the space group R 3 c (space group no. 167) , a = 4.952, c = 14.003 Å . It oxidizes to vanadium (V) oxide in air. At high temperatures it decomposes to form other vanadium oxides.

safety instructions

Vanadium (III) oxide is classified as carcinogenic and germ cell mutagenic in category 2.

Individual evidence

1. ↑ ^{a b c d} Entry on vanadium (III) oxide in the GESTIS substance database of the IFA , accessed on February 16, 2017(JavaScript required) .
2. ↑ ^{a b} data sheet vanadium (III) oxide from Sigma-Aldrich , accessed on May 22, 2017 ( PDF ).
3. ↑ Mineral Atlas: Karelianite
4. ↑ ^{a b} Georg Brauer (Ed.) U. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume III, Ferdinand Enke, Stuttgart 1981, ISBN 3-432-87823-0 , p. 1419.