Solid phase
Official name
Vanadium(IV) oxide
Secondary names
Vanadium dioxide; Divanadium tetroxide; Dioxovanadium
CAS number
12036-21-4
Type
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 bonds
  Bond Number
$V-O$ 2
$V=O$ 1
$V-V$ 1
Class
alkali salts (06)
Type
simple alkali salts (06.01)
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 $(VO_2)_2$
Molar mass
82.94 $g/mol$
Density
4.571 $g/cm^3$
State NTP
solid
Phase transitions
Phase transition type Other phases Temperature - Pressure
solid-solid tetragonal phase > 67°C (> 340 K)
Refringence type
biaxial
Pure color
blue
Color
blue-black
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