title: Hydrogen-Stuffed, Quartz-like Water Ice.
abstract: Through use of in situ Raman spectroscopy and single-crystal/powder X-ray diffraction, we resolve the "C0" phase structure discovered recently in the H2+ H2O system. This phase forms at ∼400 MPa and 280 K with the nominal composition (H2O)2H2and three formula units per unit cell. The hexagonal structure is chiral, consisting of interpenetrating spiral chains of hydrogen-bonded water molecules and rotationally disordered H2molecules, and shows topological similarities with the mineral quartz. Like other clathrate hydrates and forms of ice, the protons of H2O molecules within C0are disordered. The large zeolite-like channels accommodate significant amounts of hydrogen (5.3% by weight) in a unique hydrogen-bonded lattice, which might be applicable to the thermodynamic conditions found on icy planetary bodies.
authors.affiliation: Geophysical Laboratory, Carnegie Institution of Washington , Washington, D.C. 20015, United States.
authors.forename: Timothy A
authors.initials: TA
authors.lastname: Strobel
authors.affiliation: Geophysical Laboratory, Carnegie Institution of Washington , Washington, D.C. 20015, United States.
authors.forename: Maddury
authors.initials: M
authors.lastname: Somayazulu
authors.affiliation: HPCAT, Geophysical Laboratory, Carnegie Institution of Washington , Argonne, Illinois 60439, United States.
authors.forename: Stanislav V
authors.initials: SV
authors.lastname: Sinogeikin
authors.affiliation: Hawaii Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology, University of Hawaii at Manoa , Honolulu, Hawaii 96822, United States.
authors.forename: Przemyslaw
authors.initials: P
authors.lastname: Dera
authors.affiliation: Department of Civil and Environmental Engineering, George Washington University , Washington, D.C. 20052, United States.|Lawrence Livermore National Laboratory , Livermore, California 94550, United States.
authors.forename: Russell J
authors.initials: RJ
authors.lastname: Hemley