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X-ray studies of the transformation from high- to low-density amorphous water
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.ORCID iD: 0000-0001-9863-9811
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
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Number of Authors: 82019 (English)In: Philosophical Transactions. Series A: Mathematical, physical, and engineering science, ISSN 1364-503X, E-ISSN 1471-2962, Vol. 377, no 2146, article id 20180164Article in journal (Refereed) Published
Abstract [en]

Here we report about the structural evolution during the conversion from high-density amorphous ices at ambient pressure to the low-density state. Using high-energy X-ray diffraction, we have monitored the transformation by following in reciprocal space the structure factor SOO(Q) and derived in real space the pair distribution function gOO(r). Heating equilibrated high-density amorphous ice (eHDA) at a fast rate (4Kmin-1), the transition to the low-density form occurs very rapidly, while domains of both high-and low-density coexist. On the other hand, the transition in the case of unannealed HDA (uHDA) and very-high-density amorphous ice is more complex and of continuous nature. The direct comparison of eHDA and uHDA indicates that the molecular structure of uHDA contains a larger amount of tetrahedral motives. The different crystallization behaviour of the derived low-density amorphous states is interpreted as emanating from increased tetrahedral coordination present in uHDA. This article is part of the theme issue 'The physics and chemistry of ice: scaffolding across scales, from the viability of life to the formation of planets'.

Place, publisher, year, edition, pages
2019. Vol. 377, no 2146, article id 20180164
Keywords [en]
ice, water, amorphous ice, phase transition
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-170090DOI: 10.1098/rsta.2018.0164ISI: 000466382900003PubMedID: 30982458OAI: oai:DiVA.org:su-170090DiVA, id: diva2:1335812
Available from: 2019-07-08 Created: 2019-07-08 Last updated: 2019-12-04Bibliographically approved

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