Cubic ice Ic free from stacking defects synthesized from ice XVII

Abstract

Among the over eighteen different forms of water ice, only the common hexagonal phase and a cubic phase are present in nature on Earth. The existence of these two polytypes, almost degenerate in energy, represents one of the most important and unresolved topics in the physics of ice. It is now widely recognised that all the samples of "cubic ice" obtained so far are instead a stacking-disordered form of ice I (i.e. ice Isd), in which both hexagonal and cubic stacking sequences of hydrogen-bonded water molecules are present. Here we describe a new method to obtain cubic ice Ic in large quantities, and demonstrate its unprecedented structural purity from two independent neutron diffraction experiments performed on two of the leading neutron diffraction instruments in Europe.

References in corpus (6)

• Mantid - Data Analysis and Visualization Package for Neutron Scattering and $\mu SR$ Experiments
• Ice structures, patterns, and processes: A view across the ice-fields
• Advances in the experimental exploration of water's phase diagram
• New porous water ice metastable at atmospheric pressure obtained by emptying a hydrogen filled ice
• Ice Ic without stacking disorder by evacuating hydrogen from hydrogen hydrate
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• Thermal Desorption of H2O-Ice: From Nanoscale Films to the Bulk
• Atomistic View of Homogeneous Nucleation of Water into Polymorphic Ices
• Euclid preparation. XXIX. Water ice in spacecraft part I: The physics of ice formation and contamination
• Molecular-Resolution Imaging of Ice Crystallized from Liquid Water
• Structure of crystalline water ice formed through neon matrix sublimation under cryogenic and vacuum conditions
• A Generalized Nucleation Theory for Ice Crystallization
• Three-step growth of vapor-deposited ice under mesospheric temperature and water vapor conditions
• Equivalence of residual entropy of hexagonal and cubic ices from tensor network methods