Structure and compression of crystalline methane at high pressure and room temperature
- 1 August 1980
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 37 (3), 288-289
- https://doi.org/10.1063/1.91909
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).Keywords
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