Solid phase
Official name
Iridium(IV) oxide
Secondary names
Iridium dioxide; Dioxoiridium
CAS number
12030-49-8
Type
Family
covalent network solid
Class
tridimentional covalent network solid
Compound type
oxide
Chemical composition
Formula
IrO2
Chemical formula
IrO2
Elemental formula
Ir O2
Isotope mixture type
terrestrial abundance
6.0
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
Ir Iridium element 1 0.3333333333333333 1 constituent element main
O Oxygen element 2 0.6666666666666666 1 constituent element main
Chemical bonds
  Bond Number
≥Ir−O− 6
Class
tridimensional covalent networks (11)
Type
one metal and one non-metal (or metalloid) tridimensional networks (11.04)
Phase type
crystalline
Crystal system
tetragonal
Crystal class
ditetragonal-dipyramidal
Crystal class symbol
4/mmm (D4h)
Crystal spacegroup
P4(2)/mnm
Molar mass
224.22 g/mol
Density
11.66 g/cm3
State NTP
solid
Phase transitions
Phase transition type Other phases Temperature - Pressure
solid-liquid decomposition 1100°C (1370 K)
Refringence type
uniaxial
Pure color
blue
Color
dark blue, blue-black
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