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High P-T transformations of nitrogen to 170 GPa

Abstract : X-ray diffraction and optical spectroscopy techniques are used to characterize stable and metastable transformations of nitrogen compressed up to 170GPa and heated above 2500K. X-ray diffraction data show that ɛ-N2 undergoes two successive structural changes to complex molecular phases ζ at 62GPa and a newly discovered κ at 110GPa. The latter becomes an amorphous narrow gap semiconductor on further compression and if subjected to very high temperatures (∼2000K ) crystallizes to the crystalline cubic-gauche-N structure (cg-N) above 150GPa. The diffraction data show that the transition to cg-N is accompanied by 15% volume reduction.
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Submitted on : Wednesday, March 9, 2022 - 4:47:12 PM
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Eugene Gregoryanz, Alexander F. Goncharov, Chrystele Sanloup, Maddury Somayazulu, Ho-Kwang Mao, et al.. High P-T transformations of nitrogen to 170 GPa. Journal of Chemical Physics, 2007, 126, pp.184505-184505. ⟨10.1063/1.2723069⟩. ⟨insu-03603192⟩



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