Journal
CHEMICAL PHYSICS LETTERS
Volume 473, Issue 1-3, Pages 72-74Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cplett.2009.03.072
Keywords
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Funding
- National Science Foundation of China [50571111, 10874230]
- Ministry of Science and Technology of China [2005CB724400]
- Department of Energy (DOE) [DE-AC02-76SF00515]
- NASA [PGG-NNX08AL27G]
- NSF [DMR-0821584]
- DOE-BES [DE-AC02-06CH11357]
- DOE-NNSA
- W. M. Keck Foundation
- Division Of Earth Sciences
- Directorate For Geosciences [911492, 0810255] Funding Source: National Science Foundation
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Solid methane (CH(4)) was compressed up to 202 GPa at 300 K in a diamond-anvil cell. The crystal structure and equation of state over this entire range were determined from angle dispersive X-ray diffraction results. CH(4) undergoes phase transitions from rhombohedral to a simple cubic phase at 19 GPa and from simple cubic to a higher pressure cubic phase at approximately 94 GPa. This higher pressure cubic phase was stable to the maximum pressure investigated. Combined with previous optical measurements, it was found that at room temperature compressed CH(4) remains an insulator with cubic structure to 202 GPa. (C) 2009 Elsevier B. V. All rights reserved.
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