Raman, infrared, and x-ray evidence for new phases of nitrogen at high pressures and temperatures

E Gregoryanz, AF Goncharov, RJ Hemley, HK Mao, M Somayazulu, GY Shen

Research output: Contribution to journalArticlepeer-review

Abstract

We report the existence and characterization of a distinct class of molecular phases of solid nitrogen at high pressures and temperatures by Raman scattering, infrared absorption, and powder synchrotron x-ray diffraction. The most remarkable is a phase (theta) which is characterized by strong intermolecular interactions and infrared vibron absorption. A second lower-pressure phase (iota) is diatomic with orientationally equivalent molecules. Both phases can be quenched to room temperature and are observed over a wide P-T range from 20 to 100 GPa and 30 to 1000 K. The results suggest a major revision of the phase relations of nitrogen at high pressures and temperatures.

Original languageEnglish
Article number224108
Number of pages5
JournalPhysical review B: Condensed matter and materials physics
Volume66
Issue number22
DOIs
Publication statusPublished - 1 Dec 2002

Keywords

  • SOLID NITROGEN
  • VIBRATIONAL DYNAMICS
  • MEGABAR PRESSURES
  • GPA
  • HYDROGEN
  • SPECTROSCOPY
  • N-2
  • DIFFRACTION
  • TRANSITIONS
  • KBAR

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