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Two Dimensional Ice from First Principles: Structures and Phase Transitions.

Ji Chen1,2, Georg Schusteritsch2,3,4, Chris J Pickard2,3,4

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|January 30, 2016
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Summary
This summary is machine-generated.

This study reveals new low-dimensional water ice structures under pressure. The pentagonal phase is stable up to 2 GPa, followed by square and rhombic phases, offering insights into confined ice behavior.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Physical chemistry

Background:

  • Understanding low-dimensional water ice structures and phase transitions is crucial for fields like cloud microphysics and tribology.
  • Significant knowledge gaps exist regarding the behavior of confined two-dimensional (2D) ice.

Purpose of the Study:

  • To investigate the structural properties and phase transitions of confined 2D water ice under varying pressures using first-principles calculations.
  • To provide a comprehensive understanding of how pressure and confinement width influence 2D ice structures.

Main Methods:

  • First-principles calculations were employed to simulate and analyze the behavior of 2D water ice.
  • Enthalpy calculations were performed to determine the stability of different ice phases as a function of pressure.

Main Results:

  • At ambient pressure, hexagonal and pentagonal monolayer ice structures exhibit the lowest enthalpy.
  • The pentagonal phase becomes the most stable upon mild compression, persisting up to approximately 2 GPa.
  • Beyond 2 GPa, square and rhombic ice phases emerge as the most stable, with the square phase aligning with recent experimental findings in graphene confinement.

Conclusions:

  • The study elucidates the pressure-dependent structural evolution of confined 2D water ice.
  • Observed ice structures are highly sensitive to both confining pressure and the confinement width.
  • This research offers a novel perspective on the fundamental properties of 2D confined ice.