On the heterogeneous character of water's amorphous polymorphism

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dc.creatorKoza, M. M.
dc.creatorMay, R. P.
dc.creatorSchober, H.
dc.date2007-06-22
dc.date.accessioned2026-07-07T08:11:53Z
dc.date.available2026-07-07T08:11:53Z
dc.descriptionIn this letter we report {\it in situ} small--angle neutron scattering results on the high--density (HDA) and low-density amorphous (LDA) ice structures and on intermediate structures as found during the temperature induced transformation of HDA into LDA. We show that the small--angle signal is characterised by two $Q$ regimes featuring different properties ($Q$ is the modulus of the scattering vector defined as $Q = 4π\sin{(Θ)}/λ_{\rm i}$ with $Θ$ being half the scattering angle and $λ_{\rm i}$ the incident neutron wavelength). The very low--$Q$ regime ($< 5\times 10^{-2}$ Å$^{-1}$) is dominated by a Porod--limit scattering. Its intensity reduces in the course of the HDA to LDA transformation following a kinetics reminiscent of that observed in wide--angle diffraction experiments. The small--angle neutron scattering formfactor in the intermediate regime of $5 \times 10^{-2} < Q < 0.5$ Å$^{-1}$ HDA and LDA features a rather flat plateau. However, the HDA signal shows an ascending intensity towards smaller $Q$ marking this amorphous structure as heterogeneous. When following the HDA to LDA transition the formfactor shows a pronounced transient excess in intensity marking all intermediate structures as strongly heterogeneous on a length scale of some nano--meters.
dc.identifierhttps://arxiv.org/abs/0706.3296
dc.identifierhttp://arxiv.org/abs/0706.3296
dc.identifierJ. Appl. Cryst. 40, s517-s521, (2007)
dc.identifierdoi:10.1107/S0021889807004992
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/132264
dc.subjectDisordered Systems and Neural Networks
dc.subjectSoft Condensed Matter
dc.titleOn the heterogeneous character of water's amorphous polymorphism
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