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Water's polyamorphic transitions and amorphization of ice under pressure
Umeå University, Faculty of Science and Technology, Department of Physics.
2004 (English)In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 120, no 13, 6207-6213 p.Article in journal (Refereed) Published
Abstract [en]

Transformations of water’s high density amorph (HDA) to low density amorph (LDA) and of LDA’s to cubic ice (Ic) have been studied by in situ thermal conductivity κ measurements at high pressures. The HDA to LDA transformation is unobservable at p of 0.07 GPa, indicating that, for a fixed heating rate, an increase in pressure increases the temperature of HDA to LDA transformation and decreases that of LDA to ice Ic, causing thereby the two transformations to merge, and HDA appears to convert directly to ice Ic. Thus either LDA forms but converts extremely rapidly to ice Ic, or LDA does not form. At a fixed p and T, in the range of pressure amorphization of hexagonal ice, κ continues to decrease with time. Therefore, the amorphization of ice Ih is kinetically controlled. When HDA at 1 GPa was heated from 130 to 157 K and densified to very HDA, its κ increased by 3%. Our findings and a scrutiny of earlier reports show that a reversible transition between HDA and LDA does not occur at ∼135 K and ∼0.2 GPa. Since there is no unique HDA, it is difficult to justify the conjecture for a second critical point for water.

Place, publisher, year, edition, pages
API , 2004. Vol. 120, no 13, 6207-6213 p.
Keyword [en]
water, polymorphic transformations, amorphisation, ice, thermal conductivity, critical points
National Category
Physical Sciences
URN: urn:nbn:se:umu:diva-12303DOI: 10.1063/1.1651063OAI: diva2:151974
Available from: 2007-03-30 Created: 2007-03-30 Last updated: 2011-11-11Bibliographically approved

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