# On the nature of amorphous polymorphism of water

Source: [On the nature of amorphous polymorphism of water](<https://www.sota2.com/research/paper/68fa26f32c2a3760193bed41>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T11:43:35.428Z

Authors: Michael Marek Koza, Burkhard Geil, Katrin Winkel, Christian Koehler, Franz Czeschka, Marco Scheuermann, Helmut Schober, Thomas Hansen

Published: 2005-06-21T11:41:00.000Z

## Abstract

We report elastic and inelastic neutron scattering experiments on different amorphous ice modifications. It is shown that an amorphous structure (HDA') indiscernible from the high-density phase (HDA), obtained by compression of crystalline ice, can be formed from the very high-density phase (vHDA) as an intermediate stage of the transition of vHDA into its low-density modification (LDA'). Both, HDA and HDA' exhibit comparable small angle scattering signals characterizing them as structures heterogeneous on a length scale of a few nano-meters. The homogeneous structures are the initial and final transition stages vHDA and LDA', respectively. Despite, their apparent structural identity on a local scale HDA and HDA' differ in their transition kinetics explored by in situ experiments. The activation energy of the vHDA-to-LDA' transition is at least 20 kJ/mol higher than the activation energy of the HDA-to-LDA transition.

## Recorded benchmark results

A research result applies to its stated dataset, split, metric and evaluation configuration. Compare like-for-like settings, preserve the metric's unit and direction, and distinguish paper-reported results from independent reproduction. The best result recorded here is not a claim of exhaustive, current global coverage.

## Original sources and implementation

[Original paper](<https://arxiv.org/abs/cond-mat/0506532>)

[PDF](<https://arxiv.org/pdf/cond-mat/0506532.pdf>)