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High P-T transformations of nitrogen to 170 GPa

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Original languageEnglish
Article number184505
Number of pages5
JournalThe Journal of Chemical Physics
Volume126
Issue number18
DOIs
Publication statusPublished - 14 May 2007

Abstract

X-ray diffraction and optical spectroscopy techniques are used to characterize stable and metastable transformations of nitrogen compressed up to 170 GPa and heated above 2500 K. X-ray diffraction data show that epsilon-N(2) undergoes two successive structural changes to complex molecular phases zeta at 62 GPa and a newly discovered kappa at 110 GPa. The latter becomes an amorphous narrow gap semiconductor on further compression and if subjected to very high temperatures (similar to 2000 K) crystallizes to the crystalline cubic-gauche-N structure (cg-N) above 150 GPa. The diffraction data show that the transition to cg-N is accompanied by 15% volume reduction. (C) 2007 American Institute of Physics.

    Research areas

  • X-RAY-DIFFRACTION, HIGH-PRESSURE, VIBRATIONAL DYNAMICS, MOLECULAR NITROGEN, SOLID NITROGEN, PHASE, N-2, DISSOCIATION, MBAR

ID: 11476853