Solid phase
Official name
Tungsten trioxide
Secondary names
Tungsten(VI) oxide; Tungstic anhydride; Tungstic oxide; Liguowuite
CAS number
1314-35-8
Type
Family
covalent network solid
Class
tridimentional covalent network solid
Compound type
tungstate
Chemical composition
Formula
WO3
Chemical formula
WO3
Elemental formula
W O3
Isotope mixture type
terrestrial abundance
8.0
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
W Tungsten element 1 0.25 1 constituent element main
O Oxygen element 3 0.75 1 constituent element main
Chemical bonds
  Bond Number
≥∣W−O 6
Class
tridimensional covalent networks (11)
Type
one metal and one non-metal (or metalloid) tridimensional networks (11.04)
Equivalent mineral
Liguowuite
Phase type
crystalline
Crystal system
monoclinic
Crystal class
prismatic
Crystal class symbol
2/m (C2h)
Crystal spacegroup
P2(1)/c
Molar mass
231.84 g/mol
Density
7.16 g/cm3
State NTP
solid
Phase transitions
Phase transition type Other phases Temperature - Pressure
solid-solid to triclinic WO3 below 17°C (290 K) down to -50°C
solid-solid to orthorhombic WO3 above 330°C (603 K), up to 740°C
Refringence type
biaxial
Pure color
yellow
Color
canary yellow
Diaphaneity
transparent
Luster
greasy
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