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Updated: Oct 14, 2025

Measuring the Densities of Aqueous Glasses at Cryogenic Temperatures
Published on: June 28, 2017
Structure of High-Pressure Supercooled and Glassy Water
Riccardo Foffi1, Francesco Sciortino1
1Department of Physics, Sapienza Università di Roma, Piazzale Aldo Moro, 2, 00185 Rome, Italy.
Abstract:
We numerically investigate the structure of deep supercooled and glassy water under pressure, covering the range of densities corresponding to the experimentally produced high- and very-high-density amorphous phases. At T=188 K, a continuous increase in density is observed on varying pressure from 2.5 to 13 kbar, with no signs of first-order transitions. Exploiting a recently proposed approach to the analysis of the radial distribution function-based on topological properties of the hydrogen-bond network-we are able to identify well-defined local geometries that involve pairs of molecules separated by multiple hydrogen bonds, specific to the high- and very-high-density structures.
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