Bonding and Electronic Properties of Ice at High Pressure

Details Bonding and Electronic Properties of Ice at High Pressure Bonding and Electronic Properties of Ice at High Pressure

2011-05-31

arxiv.org/abs/1106.0050v1

Physics

Condensed Matter

Materials Science

9 pages, 6 figures

Scientific paper

The properties of water ice at megabar pressure are characterized with ab initio computer simulations. The focus lies on the metallic Cmcm phase and its insulating distorted analogue with Pnma symmetry. Both phases were recently predicted to occur at 15.5 and 12.5 Mbar respectively [Phys. Rev. Lett. 105 (2010) 195701]. The Fermi surface of the Cmcm phase is analyzed and possibility of Fermi nesting to occur is discussed. The Wannier orbital are computed for the Pnma structure and compared to ice X. While ice X shows typical sp3 hybridization, in the Pnma structure, the orbitals are deformed and no longer all aligned with the hydrogen bonds.

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