Solid phase
Official name
Tungsten(IV) oxide
Secondary names
Tungsten dioxide; dioxotungsten
CAS number
12036-22-5
Type
Family
covalent network solid
Class
tridimentional covalent network solid
Compound type
oxide
Chemical composition
Formula
$WO_2$
Chemical formula
WO2
Elemental formula
W O2
Isotope mixture type
terrestrial abundance
6.0
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
$W$ Tungsten element 1 0.3333333333333333 1 constituent element main
$O$ Oxygen element 2 0.6666666666666666 1 constituent element main
Composition comments
probable presence of metal-metal W-W bonds
Chemical bonds
  Bond Number
$\geq\mid W-W \mid\leq$ 2
$\geq\mid W-O$ 6
Class
tridimensional covalent networks (11)
Type
one metal and one non-metal (or metalloid) tridimensional networks (11.04)
Phase name
Distorted rutile
Phase type
crystalline
Crystal system
monoclinic
Crystal class
prismatic
Crystal class symbol
2/m (C2h)
Crystal spacegroup
P2(1)/c
Molar mass
215.839 $g/mol$
Density
10.72 (25°C) $g/cm^3$
State NTP
solid
Phase transitions
Phase transition type Other phases Temperature - Pressure
solid-liquid decomposition liquid 1500 - 1600 °C
Refringence type
biaxial
Refringence sign
unknown
Pure color
bronze
Color
golden braun, bronze
Diaphaneity
opaque
Luster
metallic
Links