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High temperature structures and orientational disorder in compressed solid nitrogen.

Leonardo Tassini1, Federico Gorelli, Lorenzo Ulivi

  • 1Dipartimento di Fisica, Università di Firenze, via G. Sansone 1, I-50019 Sesto Fiorentino, Italy. Leonardo.Tassini@wmi.badw-muenchen.de

The Journal of Chemical Physics
|March 4, 2005
PubMed
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High-pressure Raman spectroscopy reveals new details about solid nitrogen's phase transitions. This study extends the known phase diagram and clarifies the nature of disorder in delta and deltaloc phases up to 500 K.

Area of Science:

  • Condensed matter physics
  • Materials science
  • High-pressure physics

Background:

  • Solid nitrogen exhibits complex phase behavior under high pressure and temperature.
  • Understanding these phases is crucial for materials science and planetary science.

Purpose of the Study:

  • To experimentally investigate phase transitions in compressed solid nitrogen at high temperatures.
  • To extend the equilibrium phase diagram of nitrogen.
  • To elucidate the nature of disorder in the delta and deltaloc phases.

Main Methods:

  • Raman spectroscopy was employed to study solid nitrogen.
  • Measurements were conducted at pressures between 10 and 20 GPa and temperatures up to 500 K.
  • Isobaric scans across phase transitions allowed for accurate line shape and width analysis.

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Main Results:

  • The equilibrium phase diagram of nitrogen was extended to higher temperatures (500 K).
  • Raman scattering line shape and width analysis provided insights into the disorder in epsilon, delta, and deltaloc phases.
  • A distinct shoulder in the nu2 band of the deltaloc phase was observed.

Conclusions:

  • The study provides more precise conclusions on the nature of disorder in different solid nitrogen phases.
  • The observed shoulder suggests potential occupation of sites with different symmetries by disk molecules in the deltaloc phase.
  • This research enhances the understanding of high-pressure, high-temperature condensed matter systems.