New Phases of Solid Nitrogen

Details New Phases of Solid Nitrogen New Phases of Solid Nitrogen

2001-11-26

arxiv.org/abs/cond-mat/0111482v1

Physics

Condensed Matter

Materials Science

Scientific paper

We report the discovery of a new class of molecular phases of solid nitrogen at high pressures and temperatures by Raman and infrared spectroscopy and powder x-ray diffraction. Unlike the molecular phases consisting of disk- and sphere-like molecular disorder ($\delta$-, $\epsilon$- and $\zeta$-N$_2$) and reportedly stable over a wide P-T range, one of the new phases ($\iota$) is diatomic with disk-like molecules. A second new phase (the higher pressure $\theta$-phase) is characterized by strong intermolecular interactions and infrared vibron absorption. Both phases exhibit wide P-T ranges of stability and metastability.

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