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
$IrO_2$
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
$\geq Ir-O-$ 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 $g/cm^3$
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
Links