Solidifying(Freezing) Pressure of gases

Here I summarize the solidifying pressure (liquid-solid transition) of common gases at room temperature (300 K).

These are the pressures where you start to see diffraction lines from gases loaded in pressure cells.

Noble gases

He         11.5 GPa¹

Ne         4.7  GPa²

Ar         1.3  GPa¹

Kr         0.83 GPa¹

Xe         0.42 GPa¹

summarized in Shimuzu  et al Phys. Rev. B 71, 014108 (2005)

¹ Rare Gas Solids, edited by J. A. Venables and M. L. Klein (Academic, New York, 1976), Vols. I and II.

² Finger et al  Appl. Phys. Lett. 39, 892 (1981)

         H₂          5.4 GPa   1         

          H₂O         1.3 GPa (ice VI)     

                     2.3 GPa (ice VII) 2 

CH₄         1.7 GPa   3

   N₂          2.4 GPa   4   

CO₂         0.5 GPa   5

  CO          2.5 GPa   6  

O₂          5.5 GPa   7

F₂          2.4 GPa   8

Cl₂         2.7 GPa   9

1 (this is the lowest Z material, diffraction pattern is difficult to collect), Ji et al Nature 573, 558–562 (2019)

2  Kamb and Davis, PNAS, 52 (6) 1433-1439 (1964) | Bezacie et al J. Chem. Phys. 141, 104505 (2014)

3  Hirai et al J. Phys.: Conf. Ser. 121 102001

4 Zinn et al  J. Chem. Phys. 87 126 (1987)

5 Santoro and Gorelli, Chem. Soc. Rev. 35, 918-931 (2006)

6 Katz et al J. Phys. Chem. 88 (15), 3176-3179 (1984)

7 Schiferl et al Acta Cryst. B37, 1329-1332 (1981)

8 Schiferl et al J. Chern. Phys., Vol. 87, No.5, (1987)

9 Johannsen and Holzapfe J. Phys. C: Solid State Phys. 16 L1177 (1983)

Br2

HCl

HF

N2O