Multicomponent dynamics in amorphous ice studied using X-ray photon correlation spectroscopy at elevated pressure and
Aigerim Karina1, Hailong Li2,3, Tobias Eklund2,4,5
1Department of Physics, Stockholm University, Stockholm, Sweden.
Communications Chemistry
|March 17, 2025
Summary
Investigating supercooled water
Area of Science:
- Condensed matter physics
- Physical chemistry
- Materials science
Background:
- Understanding the pressure dependence of glass-forming liquids is crucial.
- Supercooled water exhibits distinct high-density and low-density amorphous states.
- Predictive models suggest opposing pressure dependencies for their glass transitions.
Purpose of the Study:
- To experimentally probe the glass transition of amorphous ices under elevated pressure and cryogenic conditions.
- To demonstrate the feasibility of X-ray photon correlation spectroscopy (XPCS) in a diamond anvil cell at low temperatures.
- To observe and characterize dynamic behaviors near the glass transition in high-density amorphous ice.
Main Methods:
- Utilized X-ray photon correlation spectroscopy (XPCS).
- Employed a diamond anvil cell (DAC) for high-pressure generation.
- Conducted experiments at cryogenic temperatures.
Main Results:
- Observed two distinct dynamic components approaching the glass transition temperature.
- Determined the glass transition for high-density amorphous ice at approximately 0.08 GPa.
- Found the glass transition temperature at elevated pressure is higher than at ambient conditions.
Conclusions:
- Confirmed the feasibility of XPCS for studying amorphous ices under extreme conditions.
- Provided experimental evidence for the complex dynamic behavior of supercooled water under pressure.
- The findings contribute to understanding the phase behavior of water and other glass-forming liquids.
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