High-pressure transitions in methane hydrate

Three recent studies of the high-pressure transformations of methane hydrate [Chem. Phys. Lett. 325 (2000) 490; Proc. Natl. Acad. Sci. 97 (2000) 13484; Nature 410 (2001) 661] have reported apparently different behaviours. Detailed comparison of our X-ray and neutron diffraction data with those obtai...

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Bibliographic Details
Published inChemical physics letters Vol. 350; no. 5; pp. 459 - 465
Main Authors Loveday, J.S., Nelmes, R.J., Guthrie, M.
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 28.12.2001
Elsevier Science
Subjects
Condensed matter: structure, mechanical and thermal properties
Crystalline state (including molecular motions in solids)
Crystallographic aspects of phase transformations; pressure effects
Exact sciences and technology
Physics
Structure of solids and liquids; crystallography
Water
Methane
Compression
Pressure effects
Phase transformations
Neutron diffraction
Liquefaction
Crystal chemistry
Molecular crystals
XRD
Experimental study
Very high pressure
Solidification
Organic compounds
Hydrates
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Summary:Three recent studies of the high-pressure transformations of methane hydrate [Chem. Phys. Lett. 325 (2000) 490; Proc. Natl. Acad. Sci. 97 (2000) 13484; Nature 410 (2001) 661] have reported apparently different behaviours. Detailed comparison of our X-ray and neutron diffraction data with those obtained in earlier work shows that there is in fact consistent behaviour on isothermal compression at room temperature with a transition from the clathrate I structure hydrate to a hexagonal hydrate with an unknown structure at ∼0.9 GPa.
ISSN:0009-2614
1873-4448
DOI:10.1016/S0009-2614(01)01328-8