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Nuclear quantum effects in phase transition between Ice VII and Ice X
Kazuaki Kuwahata1, Masanori Tachikawa1
1Graduate School of Nanobioscience, Yokohama City University, Yokohama, Japan.
Nuclear quantum effects influence high-pressure ice phase transitions. Quantum mechanics facilitates the Ice VII to Ice X transition, impacting pressure differently in each phase.
Area of Science:
- Materials Science
- Quantum Mechanics
- Geophysics
Background:
- Theoretical modeling of high-pressure ice is complex due to nuclear quantum effects.
- Accurately reflecting ice properties requires understanding these quantum mechanical influences.
Purpose of the Study:
- To investigate the role of nuclear quantum effects in the phase transition between Ice VII and Ice X.
- To explore how quantum effects influence the pressure-volume relationship in these ice phases.
Main Methods:
- Utilizing ab initio path-integral molecular dynamics.
- Simulating the behavior of hydrogen atoms within the ice lattice under high pressure.
Main Results:
- Quantum effects were found to facilitate the phase transition from Ice VII to Ice X.
- Observed isotope effects align with experimental data.
- In Ice VII, quantum effects decrease pressure by centralizing protons.
- In Ice X, quantum effects increase pressure due to zero-point vibration kinetic energy.
Conclusions:
- Nuclear quantum effects are crucial for accurately modeling high-pressure ice phases.
- The distinct manifestation of quantum effects in Ice VII and Ice X explains observed pressure-volume behaviors and isotope effects.
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