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Relaxation dynamics and transformation kinetics of deeply supercooled water: Temperature, pressure, doping, and proton/deuteron isotope effects
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Number of Authors: 11
2017 (English)In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 147, no 3, 034506Article in journal (Refereed) Published
Abstract [en]

Above its glass transition, the equilibrated high-density amorphous ice (HDA) transforms to the low-density pendant (LDA). The temperature dependence of the transformation is monitored at ambient pressure using dielectric spectroscopy and at elevated pressures using dilatometry. It is found that near the glass transition temperature of deuterated samples, the transformation kinetics is 300 times slower than the structural relaxation, while for protonated samples, the time scale separation is at least 30 000 and insensitive to doping. The kinetics of the HDA to LDA transformation lacks a proton/deuteron isotope effect, revealing that this process is dominated by the restructuring of the oxygen network. The x-ray diffraction experiments performed on samples at intermediate transition stages reflect a linear combination of the LDA and HDA patterns implying a macroscopic phase separation, instead of a local intermixing of the two amorphous states.

Place, publisher, year, edition, pages
2017. Vol. 147, no 3, 034506
National Category
Chemical Sciences Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-145889DOI: 10.1063/1.4993790ISI: 000406129100027OAI: oai:DiVA.org:su-145889DiVA: diva2:1135046
Available from: 2017-08-22 Created: 2017-08-22 Last updated: 2017-08-22Bibliographically approved

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Amann-Winkel, Katrin
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