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Related Experiment Videos

Structure of high-density amorphous ice under pressure.

S Klotz1, G Hamel, J S Loveday

  • 1Physique des Milieux Condensés, UMR 7602, Université P.M. Curie, B77, 4 Place Jussieu, 75252 Paris, France.

Physical Review Letters
|January 7, 2003
PubMed
Summary

High-density amorphous ice (HDA) was studied under pressure using neutron diffraction. Compression significantly contracts the second coordination shell, leading to interpenetrating hydrogen bond networks.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Chemistry

Background:

  • Amorphous ices are structurally disordered forms of water ice.
  • Understanding their behavior under pressure is crucial for planetary science and materials research.
  • High-density amorphous ice (HDA) is a key phase relevant to these fields.

Purpose of the Study:

  • To investigate the structural changes in high-density amorphous ice (HDA) under high pressure.
  • To elucidate the role of coordination shells and hydrogen bonding in HDA compression.
  • To provide insights into the molecular-level rearrangements within HDA.

Main Methods:

  • In situ neutron diffraction experiments were conducted.
  • High-density amorphous ice (HDA) samples were subjected to pressures up to 2.2 GPa.

Related Experiment Videos

  • Neutron diffraction data were analyzed to determine structural parameters at 100 K.

    • Main Results:

    • Compression of HDA primarily involves a significant contraction (approx. 20%) of the second neighbor coordination shell.
    • The first coordination shell remains structurally intact during compression.
    • Hydrogen bond orientations indicate no bonding between first and second shells, suggesting interpenetrating networks.

    Conclusions:

    • HDA compression is dominated by the collapse of the second coordination shell.
    • The structure of HDA under pressure is characterized by increasingly interpenetrating hydrogen bond networks.
    • These findings offer a detailed molecular-level understanding of amorphous ice behavior under extreme conditions.