High-Pressure Amorphous Nitrogen

Details High-Pressure Amorphous Nitrogen High-Pressure Amorphous Nitrogen

2001-05-04

arxiv.org/abs/cond-mat/0105101v1

Physics

Condensed Matter

Materials Science

5 pages, 4 figures

Scientific paper

10.1103/PhysRevB.64.052103

The phase diagram and stability limits of diatomic solid nitrogen have been explored in a wide pressure--temperature range by several optical spectroscopic techniques. A newly characterized narrow-gap semiconducting phase $\eta$ has been found to exist in a range of 80--270 GPa and 10--510 K. The vibrational and optical properties of the $\eta$ phase produced under these conditions indicate that it is largely amorphous and back transforms to a new molecular phase. The band gap of the $\eta$ phase is found to decrease with pressure indicating possible metallization by band overlap above 280 GPa.

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