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Polarisation spontanée de l'hydrogène dense.

Spontaneous polarization in dense hydrogen.

Auteurs : EDWARDS B., ASHCROFT N. W.

Type d'article : Article

Résumé

Below 140 K, solid hydrogen undergoes a transition at about 1.5 million atmospheres between two orientationally ordered states. The intermolecular vibrational mode (the vibron) shifts to a lower frequency at this transition, and becomes strongly infrared-active. So far is known, hydrogen remains in this phase to the highest pressures yet reached. The authors report first-principles calculations of the structure of this phase using electronic density-functional theory. They find that it develops a spontaneous polarization at around ninefold compression relative to the volume at 1 atmosphere and that there is a corresponding movement of proton pairs away from their ideal lattice sites.

Détails

  • Titre original : Spontaneous polarization in dense hydrogen.
  • Identifiant de la fiche : 1998-1457
  • Langues : Anglais
  • Source : Nature - vol. 388 - n. 6643
  • Date d'édition : 14/08/1997
  • Document disponible en consultation à la bibliothèque du siège de l'IIF uniquement.

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