Structure and compression of crystalline methane at high pressure and room temperature
Abstract
Methane, CH4, crystallizes in the face-centered cubic metal structure (space group Fm3m) at 15.9 kbar and 20 °C. Cubic unit-cell edges at 16.1, 28.9, 39.5, and 52.1 kbar are 5.4434, 5.3064, 5.1963, and 5.0947 Å, respectively. The isothermal bulk modulus, calculated from a first-order Murnaghan equation of state (K'=4), is 49±9 kbar. Methane transforms to a second as yet unidentified high-pressure solid phase at 52.5 kbar (20 °C).
- Publication:
-
Applied Physics Letters
- Pub Date:
- August 1980
- DOI:
- 10.1063/1.91909
- Bibcode:
- 1980ApPhL..37..288H
- Keywords:
-
- Cryogenic Fluids;
- Crystal Structure;
- Face Centered Cubic Lattices;
- Methane;
- Pressure Effects;
- Crystal Growth;
- High Pressure;
- Room Temperature;
- Single Crystals;
- X Ray Diffraction;
- Solid-State Physics;
- 62.50.+p;
- 64.30.+t;
- 61.10.Fr;
- 61.65.+d;
- High-pressure and shock wave effects in solids and liquids;
- Equations of state of specific substances