Journal
PHYSICAL REVIEW B
Volume 66, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.66.224108
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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.
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