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Spontaneous transformation of water's high-density amorph and a two-stage crystallization to ice VI at 1 GPa: a dielectric study
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 24, 11662-11671 p.Article in journal (Refereed) Published
Abstract [en]

Dielectric relaxation spectra of a metastable crystal phase formed on implosive and exothermic transformation of pressure-amorphized hexagonal ice have been measured in situ at 0.97 GPa pressure over a range of temperature. The metastable phase showed no relaxation peak at 130 K and 0.97 GPa. When heated at a fixed pressure of 0.97 GPa, it began to transform at ∼ 145 K exothermally to a phase whose relaxation rate and equilibrium dielectric permittivity increased. A second, but slower exothermic transformation also occurred at ∼ 175 K. After keeping at 213 K, the relaxation rate and equilibrium permittivity reached the known values of these two quantities for ice VI. Thus the metastable phase transformed to ice VI in two stages. It is conjectured that the intermediate phase in this transformation could be ice XII. The rate of transformation is not determined by the reorientational relaxation rate of water molecules in the ices

Place, publisher, year, edition, pages
2004. Vol. 120, no 24, 11662-11671 p.
Keyword [en]
water, amorphisation, ice, crystallisation, permittivity, dielectric relaxation
National Category
Condensed Matter Physics
URN: urn:nbn:se:umu:diva-12305DOI: 10.1063/1.1747946OAI: diva2:151976
Available from: 2011-11-11 Created: 2007-03-30 Last updated: 2011-11-11Bibliographically approved

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