Molecular character of the metallic high-pressure phase of oxygen

AF Goncharov, E Gregoryanz, RJ Hemley, HK Mao

Research output: Contribution to journalArticlepeer-review

Abstract

We report Raman measurements of solid oxygen under high static pressures up to 134 GPa through the transition to the metallic phase. Contrary to previous studies, we observed a moderate decrease in intensity of the Raman vibron at the transition, which allows us to characterize unambiguously the metallic phase as a molecular solid. The transition involves a change in lattice of molecular centers and a possible reorientation of the molecules together with a relatively weak change in molecular bonding. We observed a large pressure range of phase coexistence and hysteresis of the transformation.

Original languageEnglish
Article number100102
Number of pages4
JournalPhysical review B: Condensed matter and materials physics
Volume68
Issue number10
DOIs
Publication statusPublished - 1 Sep 2003

Keywords

  • SOLID OXYGEN
  • EPSILON-PHASE
  • GPA
  • HYDROGEN
  • DIFFRACTION

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