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APS » Journals » Phys. Rev. Lett. » Volume 87 » Issue 21
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Phys. Rev. Lett. 87, 215501 (2001) [4 pages]

Transition from Cage Clathrate to Filled Ice: The Structure of Methane Hydrate III

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J. S. Loveday, R. J. Nelmes, and M. Guthrie
Department of Physics and Astronomy and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom

D. D. Klug and J. S. Tse
Steacie Institute for Molecular Science, National Research Council of Canada, Ottawa K1A 0R6, Canada

Received 22 March 2001; published 31 October 2001

The structure of a new methane hydrate has been solved at 3 GPa from neutron and x-ray powder diffraction data. It is a dihydrate in which a 3D H-bonded network of water molecules forms channels surrounding the methane molecules. The network is closely related to that of ice-Ih and the methane-water system appears to be the first in which a cage clathrate hydrate is transformed into an ice-related hydrate (a “filled ice”).

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.87.215501
DOI:
10.1103/PhysRevLett.87.215501
PACS:
62.50.+p, 61.12.Ld
 
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