Ab initio studies on the structural and dynamical properties of ice

Changyol Lee, David Vanderbilt, Kari Laasonen, R. Car, M. Parrinello

Research output: Contribution to journalArticle

159 Citations (Scopus)

Abstract

The structural and dynamical properties of cubic H2O and D2O ice phases are studied using ab initio molecular dynamics combined with ultrasoft pseudopotentials. Phonon frequencies are extracted from the velocity autocorrelation functions; contributions from different normal modes in the phonon spectra are separated and easily identified. For the low-pressure phases, the agreement with the experimental data is reasonable and the isotope effects are well reproduced. High-pressure phases are also studied. The equations of state for cubic ice (ice Ic), and for the ice VII-VIII-X family, are calculated. It is found that the local-density approximation must be augmented with gradient corrections in order to obtain a proper description of the hydrogen bond. Finally, the hydrogen-bond symmetrization, which is responsible for the transition from ice VII-VIII to ice X, is studied and is predicted to occur at 49 GPa. The nature of the phase transition is found to be that of a mode-softening transition. The corresponding symmetrization is also studied in ice Ic, but it is found to occur at a pressure of 7 GPa at which ice Ic is unstable with respect to denser phases.

Original languageEnglish (US)
Pages (from-to)4863-4872
Number of pages10
JournalPhysical Review B
Volume47
Issue number9
DOIs
StatePublished - Jan 1 1993

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Ice
ice
Hydrogen bonds
hydrogen bonds
Local density approximation
Equations of state
Autocorrelation
Isotopes
softening
isotope effect
pseudopotentials
autocorrelation
Molecular dynamics
equations of state
low pressure
Phase transitions
molecular dynamics
gradients
approximation

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Lee, Changyol ; Vanderbilt, David ; Laasonen, Kari ; Car, R. ; Parrinello, M. / Ab initio studies on the structural and dynamical properties of ice. In: Physical Review B. 1993 ; Vol. 47, No. 9. pp. 4863-4872.
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Ab initio studies on the structural and dynamical properties of ice. / Lee, Changyol; Vanderbilt, David; Laasonen, Kari; Car, R.; Parrinello, M.

In: Physical Review B, Vol. 47, No. 9, 01.01.1993, p. 4863-4872.

Research output: Contribution to journalArticle

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AB - The structural and dynamical properties of cubic H2O and D2O ice phases are studied using ab initio molecular dynamics combined with ultrasoft pseudopotentials. Phonon frequencies are extracted from the velocity autocorrelation functions; contributions from different normal modes in the phonon spectra are separated and easily identified. For the low-pressure phases, the agreement with the experimental data is reasonable and the isotope effects are well reproduced. High-pressure phases are also studied. The equations of state for cubic ice (ice Ic), and for the ice VII-VIII-X family, are calculated. It is found that the local-density approximation must be augmented with gradient corrections in order to obtain a proper description of the hydrogen bond. Finally, the hydrogen-bond symmetrization, which is responsible for the transition from ice VII-VIII to ice X, is studied and is predicted to occur at 49 GPa. The nature of the phase transition is found to be that of a mode-softening transition. The corresponding symmetrization is also studied in ice Ic, but it is found to occur at a pressure of 7 GPa at which ice Ic is unstable with respect to denser phases.

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