Vanadium (III) oxide
Crystal structure | ||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
__ V 3+ __ O 2− | ||||||||||||||||
General | ||||||||||||||||
Surname | Vanadium (III) oxide | |||||||||||||||
other names |
|
|||||||||||||||
Ratio formula | V 2 O 3 | |||||||||||||||
Brief description |
black, air-sensitive powder |
|||||||||||||||
External identifiers / databases | ||||||||||||||||
|
||||||||||||||||
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 | ||||||||||||||||
|
||||||||||||||||
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 .
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
- ↑ a b c d Entry on vanadium (III) oxide in the GESTIS substance database of the IFA , accessed on February 16, 2017(JavaScript required) .
- ↑ a b data sheet vanadium (III) oxide from Sigma-Aldrich , accessed on May 22, 2017 ( PDF ).
- ↑ Mineral Atlas: Karelianite
- ↑ 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.