Transformation from molecular to polymeric nitrogen at high pressures and temperatures: In situ x-ray diffraction study

Trojan, I. A.; Eremets, M. I.; Medvedev, S. A.; Gavriliuk, A. G.; Prakapenka, V. B.
September 2008
Applied Physics Letters;9/1/2008, Vol. 93 Issue 9, p091907
Academic Journal
We studied the mechanism of the structural transformation of molecular nitrogen to atomic single-bonded nitrogen with a cubic gauche (cg-N) crystal structure using x-ray diffraction in situ at a pressure of ∼140 GPa and temperatures up to 2000 K in a diamond anvil cell. The anvils, with a toroidal shape, allowed us to drastically increase the volume of the sample, reduce the acquisition time of the diffraction pattern, and improve the quality of the Raman spectra. Molecular nitrogen transforms to the cg-N phase through an intermediate disordered state. The Raman spectra are in good agreement with recent theoretical calculations.


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