Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 118, Issue 30, Pages -Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2108194118
Keywords
polyamorphism; glassy water; high-density amorphous ice; Pressure Induced Amoiphization
Categories
Funding
- Austrian Science Fund (FWF) [I1392]
- Austrian Academy of Sciences (OAW)
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The study prepared high-density glasses similar to high-density amorphous ice through rapid cooling and pressurization. The experimental results suggest a thermodynamically continuous connection of amorphous ices with liquids.
The nature of amorphous ices has been debated for more than 35 years. In essence, the question is whether they are related to ice polymorphs or to liquids. The fact that amorphous ices are traditionally prepared from crystalline ice via pressure-induced amorphization has made a clear distinction tricky. In this work, we vitrify liquid droplets through cooling at >= 106 K center dot s-1 and pressurize the glassy deposit. We observe a first order-like densification upon pressurization and recover a high-density glass. The two glasses resemble low- and high-density amorphous ice in terms of both structure and thermal properties. Vitrified water shows all features that have been reported for amorphous ices made from crystalline ice. The only difference is that the hyperquenched and pressurized deposit shows slightly different crystallization kinetics to ice I upon heating at ambient pressure. This implies a thermodynamically continuous connection of amorphous ices with liquids, not crystals.
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