Vanadium(IV) oxide | SSHADE

Solid phase

Official name: Vanadium(IV) oxide

Name and identifiers

Secondary names: Vanadium dioxide; Divanadium tetroxide; Dioxovanadium
CAS number: 12036-21-4

Family: ionic solid
Class: polar molecular solid
Compound type: oxide

Chemical composition

Formula: $VO_2$
Chemical formula: VO2
Elemental formula: (V4+) (O2-)2
Isotope mixture type: terrestrial abundance

6.0

	Formula	Name	Family	Number min-max	Mole fraction	Isotope mole fraction	State	Relevance
	$V^{4+}$	Vanadium(IV) cation	element	1	0.3333333333333333	1	constituent cation	main
	$O^{2-}$	Oxide anion	element	2	0.6666666666666666	1	constituent anion	main

Chemical functions and bonds

Chemical bonds

	Bond	Number
	$V-O$	2
	$V=O$	1
	$V-V$	1

Class: alkali salts (06)
Type: simple alkali salts (06.01)

Crystallography

Phase type: crystalline
Crystal system: monoclinic
Crystal class: prismatic
Crystal class symbol: 2/m (C2h)
Crystal spacegroup: P2(1)/c
Comments: the molecular unit is the dimer $(VO_2)_2$

Physical properties

Molar mass: 82.94 $g/mol$
Density: 4.571 $g/cm^3$

Thermodynamical properties

State NTP

solid

Phase transitions

Phase transition type	Other phases	Temperature - Pressure
solid-solid	tetragonal phase	> 67°C (> 340 K)

Optical properties

Refringence type: biaxial
Pure color: blue
Color: blue-black

Links and Publications

Links