Solid phase
Official name
Carbon dioxide ice polymorphs
Secondary names
CO2 ice; dry ice; solid CO2
Type
Family
molecular solid
Class
non polar molecular solid
Compound type
inorganic molecular solid
Phase diagram of $CO_2$ ice polymorphs
Chemical composition
Formula
$CO_2$
Chemical formula
CO2
Elemental formula
C O2
Isotope mixture type
terrestrial abundance
2.0
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
$CO_2$ Carbon dioxide molecule 1 1.0 1 pure main
Chemical bonds
  Bond Number
$=C=O$ 2
Class
molecular solids with apolar molecules (01)
Type
with polyatomic inorganic apolar molecules (01.07)
Polymorphs
Phase name
CO2 ice polymorphs
Phase type
crystalline
Crystal system
various
Crystal class
various
Molar mass
44.01 $g/mol$
State NTP
gas
Phase transitions
Phase transition type Other phases Temperature - Pressure
triple point solid-liquid-gas $CO_2$-I ice -- liquid $CO_2$ - gas 216.58 K (5.185 bar)
solid-liquid $CO_2$-I ice -- liquid $CO_2$ 216.58 K (0.52 MPa) - 800 K (~11 GPa)
solid-solid $CO_2$-I ice -- $CO_2$-III ice < 445 K (~11.9 GPa)
solid-solid $CO_2$-I ice -- $CO_2$-II ice 445 - 475 K (~11.9 GPa)
solid-solid $CO_2$-I ice -- $CO_2$-IV ice 475 - 630 K (~11.6 - 11.9 GPa)
solid-solid $CO_2$-I ice -- $CO_2$-VII ice 630 - 800 K (~11.2 - 11.6 GPa)
Refringence type
various
Pure color
colorless
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