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Issue 47, 2012
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Limits of metastability in amorphous ices: the neutron scattering Debye–Waller factor

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Abstract

Recently, it became clear that relaxation effects in amorphous ices play a very important role that has previously been overlooked. The thermodynamic history of amorphous samples strongly affects their transition behavior. In particular, well-relaxed samples show higher thermal stability, thereby providing a larger window to investigate their glass transitions. We here present neutron scattering experiments using fixed elastic window scans on relaxed forms of amorphous ice, namely expanded high density amorphous ice (eHDA), a variant of low density amorphous ice (LDA-II) and hyperquenched glassy water (HGW). These amorphous ices are expected to be true glassy counterparts of deeply supercooled liquid water, therefore fast precursor dynamics of structural relaxation are expected to appear below the calorimetric glass transition temperature. The Debye–Waller factor shows a very weak sub-Tg anomaly in some of the samples, which might be the signature of such fast precursor dynamics. However, we cannot find this behavior consistently in all samples at all reciprocal length scales of momentum transfer.

Graphical abstract: Limits of metastability in amorphous ices: the neutron scattering Debye–Waller factor

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Publication details

The article was received on 10 Aug 2012, accepted on 19 Oct 2012 and first published on 22 Oct 2012


Article type: Paper
DOI: 10.1039/C2CP42797D
Phys. Chem. Chem. Phys., 2012,14, 16386-16391

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    Limits of metastability in amorphous ices: the neutron scattering Debye–Waller factor

    K. Amann-Winkel, F. Löw, P. H. Handle, W. Knoll, J. Peters, B. Geil, F. Fujara and T. Loerting, Phys. Chem. Chem. Phys., 2012, 14, 16386
    DOI: 10.1039/C2CP42797D

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