Accéder directement au contenu Accéder directement à la navigation
Article dans une revue

Longitudinal sound velocities, elastic anisotropy, and phase transition of high-pressure cubic H2O ice to 82 GPa

Abstract : Water ice is a molecular solid whose behavior under compression reveals the interplay of covalent bonding in molecules and forces acting between them. This interplay determines high-pressure phase transitions, the elastic and plastic behavior of H 2 O ice, which are the properties needed for modeling the convection and internal structure of the giant planets and moons of the solar system as well as H 2 O-rich exoplanets. We investigated experimentally and theoretically elastic properties and phase transitions of cubic H 2 O ice at room temperature and high pressures between 10 and 82 GPa. The time-domain Brillouin scattering (TDBS) technique was used to measure longitudinal sound velocities (V L) in polycrystalline ice samples compressed in a diamond anvil cell. The high spatial resolution of the TDBS technique revealed variations of V L caused by elastic anisotropy, allowing us to reliably determine the fastest and the slowest sound velocity in a single crystal of cubic H 2 O ice and thus to evaluate existing equations of state. Pressure dependencies of the single-crystal elastic moduli C ij (P) of cubic H 2 O ice to 82 GPa have been obtained which indicate its hardness and brittleness. These results were compared with ab initio calculations. It is suggested that the transition from molecular ice VII to ionic ice X occurs at much higher pressures than proposed earlier, probably above 80 GPa.
Type de document :
Article dans une revue
Liste complète des métadonnées

Littérature citée [67 références]  Voir  Masquer  Télécharger

https://hal-univ-lemans.archives-ouvertes.fr/hal-01889441
Contributeur : Samuel Raetz <>
Soumis le : mardi 9 octobre 2018 - 10:21:01
Dernière modification le : mardi 14 juillet 2020 - 11:04:08
Archivage à long terme le : : jeudi 10 janvier 2019 - 13:23:38

Fichier

Kuriakose2017_v96_p134122.pdf
Fichiers éditeurs autorisés sur une archive ouverte

Identifiants

Relations

Citation

Maju Kuriakose, Samuel Raetz, Qing Hu, Sergey Nikitin, Nikolay Chigarev, et al.. Longitudinal sound velocities, elastic anisotropy, and phase transition of high-pressure cubic H2O ice to 82 GPa. Physical Review B: Condensed Matter and Materials Physics, American Physical Society, 2017, 96 (13), ⟨10.1103/PhysRevB.96.134122⟩. ⟨hal-01889441⟩

Partager

Métriques

Consultations de la notice

464

Téléchargements de fichiers

966