Jump to main content
Jump to site search

Issue 24, 2006
Previous Article Next Article

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

Author affiliations

Abstract

The exact nature of the relationship between high-density (HDA) and very-high-density (VHDA) amorphous ice is unknown at present. Here we review the relation between HDA and VHDA, concentrating on experimental aspects and discuss these with respect to the relation between low-density amorphous ice (LDA) and HDA. On compressing LDA at 125 K up to 1.5 GPa, two distinct density steps are observable in the pressure–density curves which correspond to the LDA → HDA and HDA → VHDA conversion. This stepwise formation process LDA → HDA → VHDA at 125 K is the first unambiguous observation of a stepwise amorphous–amorphous–amorphous transformation sequence. Density values of amorphous ice obtained in situ between 0.3 and 1.9 GPa on isobaric heating up to the temperatures of crystallization show a pronounced change of slope at ca. 0.8 GPa which could indicate formation of a distinct phase. We infer that the relation between HDA and VHDA is very similar to that between LDA and HDA except for a higher activation barrier between the former. We further discuss the two options of thermodynamic phase transition versus kinetic densification for the HDA → VHDA conversion.

Graphical abstract: The relation between high-density and very-high-density amorphous ice

Back to tab navigation

Additions and corrections

Publication details

The article was received on 02 Mar 2006, accepted on 27 Apr 2006 and first published on 18 May 2006


Article type: Invited Article
DOI: 10.1039/B603159E
Phys. Chem. Chem. Phys., 2006,8, 2810-2818

  •   Request permissions

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

    T. Loerting, C. G. Salzmann, K. Winkel and E. Mayer, Phys. Chem. Chem. Phys., 2006, 8, 2810
    DOI: 10.1039/B603159E

Search articles by author

Spotlight

Advertisements