AI Article Synopsis
- The study explores the structural changes in hot dense water ice using advanced techniques like synchrotron x-ray diffraction and laser-heating at high pressures.
- A notable transition from body-centered cubic (bcc) to face-centered cubic (fcc) oxygen atom arrangements occurs between 57 GPa at high temperatures, indicating a shift to superionic fcc ice.
- The researchers present a phase diagram demonstrating a broader stability range for fcc superionic ice, while also outlining the stability limits of bcc superionic ice at pressures up to 100 GPa.
Article Abstract
Structural transformation of hot dense water ice is investigated by combining synchrotron x-ray diffraction and a laser-heating diamond anvil cell above 25 GPa. A transition from the body-centered-cubic (bcc) to face-centered-cubic (fcc) oxygen atoms sublattices is observed from 57 GPa and 1500 K to 166 GPa and 2500 K. That is the structural signature of the transition to fcc superionic (fcc SI) ice. The sign of the density discontinuity at the transition is obtained and a phase diagram is disclosed, showing an extended fcc SI stability field. Present data also constrain the stability field of the bcc superionic (bcc SI) ice up to 100 GPa at least. The current understanding of warm dense water ice based on ab initio simulations is discussed in the light of present data.
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| http://dx.doi.org/10.1103/PhysRevLett.128.165701 | DOI Listing |
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