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Related Experiment Videos

Structure of a new dense amorphous ice.

J L Finney1, D T Bowron, A K Soper

  • 1Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom.

Physical Review Letters
|November 22, 2002
PubMed
Summary

Researchers detailed the structure of very-high-density amorphous ice (VHDA) using neutron diffraction. This new ice structure, denser than high-density amorphous ice (HDA), transitions sharply to low-density amorphous ice (LDA), suggesting kinetic control.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Condensed Matter Physics

Background:

  • Amorphous ice, lacking crystalline structure, exists in various forms with distinct densities.
  • High-density amorphous ice (HDA) is a known form, but its structural details and relationship to other ice phases remain areas of active research.
  • The existence of a second liquid phase of water is hypothesized, with amorphous ices considered potential candidates.

Purpose of the Study:

  • To determine the detailed atomic structure of a newly identified dense amorphous ice, termed VHDA.
  • To investigate the structural characteristics of VHDA and compare it with existing amorphous ice phases like HDA.
  • To analyze the phase transition behavior of VHDA, particularly its transformation to low-density amorphous ice (LDA).

Main Methods:

Related Experiment Videos

  • Isotope substitution neutron diffraction was employed to probe the atomic-level structure of VHDA.
  • Structural analysis focused on identifying the occupancy of interstitial sites within the amorphous ice network.
  • Phase transition studies involved monitoring the transformation of VHDA to LDA under specific conditions.

Main Results:

  • The detailed structure of VHDA was elucidated, revealing a doubled occupancy of the stabilizing interstitial location.
  • This interstitial site was previously identified in high-density amorphous ice (HDA).
  • The transition from VHDA to low-density amorphous ice (LDA) was observed to be very sharp, consistent with a thermally activated process.

Conclusions:

  • VHDA represents a distinct and denser form of amorphous ice compared to HDA.
  • The doubled interstitial occupancy in VHDA provides new insights into the structural stability of amorphous water.
  • While VHDA's higher density makes it a plausible candidate for the second liquid phase of water, its transition to LDA appears to be kinetically controlled, similar to HDA.