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The relation between high-density and very-high-density amorphous ice.

Thomas Loerting1, Christoph G Salzmann, Katrin Winkel

  • 1Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, Innrain 52a, A-6020 Innsbruck, Austria.

Physical Chemistry Chemical Physics : PCCP
|June 16, 2006
PubMed
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The study reveals a stepwise transformation sequence for amorphous ice: low-density amorphous ice (LDA) converts to high-density amorphous ice (HDA), then to very-high-density amorphous ice (VHDA). This process clarifies amorphous ice phase transitions.

Area of Science:

  • Materials Science
  • Physical Chemistry
  • Condensed Matter Physics

Background:

  • The precise relationship between high-density amorphous ice (HDA) and very-high-density amorphous ice (VHDA) remains unclear.
  • Understanding amorphous ice transformations is crucial for various scientific disciplines.

Purpose of the Study:

  • To elucidate the relationship between HDA and VHDA amorphous ice.
  • To compare the HDA-VHDA relationship with the known LDA-HDA transition.
  • To investigate the stepwise amorphous-amorphous-amorphous transformation sequence.

Main Methods:

  • Experimental compression of low-density amorphous ice (LDA) at 125 K up to 1.5 GPa.
  • In situ density measurements of amorphous ice under varying pressure and temperature.

Related Experiment Videos

  • Analysis of pressure-density curves and phase transition indicators.

    • Main Results:

    • Observed two distinct density steps during LDA compression, corresponding to LDA → HDA and HDA → VHDA conversions.
    • First unambiguous evidence of a stepwise LDA → HDA → VHDA amorphous-amorphous-amorphous transformation sequence at 125 K.
    • A significant change in slope at ~0.8 GPa during isobaric heating suggests a distinct amorphous ice phase.

    Conclusions:

    • The HDA-VHDA relationship mirrors the LDA-HDA relationship, differing mainly in a higher activation barrier.
    • The HDA → VHDA conversion may involve either a thermodynamic phase transition or kinetic densification.
    • The findings provide critical insights into the complex phase behavior of amorphous ice.