title: Transition from cage clathrate to filled ice: the structure of methane hydrate III.
abstract: 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").
authors.affiliation: Department of Physics and Astronomy and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom.
authors.forename: J S
authors.initials: JS
authors.lastname: Loveday
authors.forename: R J
authors.initials: RJ
authors.lastname: Nelmes
authors.forename: M
authors.initials: M
authors.lastname: Guthrie
authors.forename: D D
authors.initials: DD
authors.lastname: Klug
authors.forename: J S
authors.initials: JS
authors.lastname: Tse