Hexagonal Layered Polymeric Nitrogen Phase Synthesized near 250 GPa

被引:184
作者
Laniel, D. [1 ,2 ]
Geneste, G. [1 ]
Weck, G. [1 ]
Mezouar, M. [3 ]
Loubeyre, P. [1 ]
机构
[1] CEA, DAM, DIF, F-91297 Arpajon, France
[2] CNES Launcher Directorate, 52 Rue J Hillairet, F-75612 Paris, France
[3] European Synchrotron Radiat Facil, 6 Rue Jules Horowitz,BP220, F-38043 Grenoble, France
关键词
PROGRAM;
D O I
10.1103/PhysRevLett.122.066001
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The nitrogen triple bond dissociates in the 100 GPa pressure range and a rich variety of single-bonded polymeric nitrogen structures unique to this element have been predicted up to the terapascal pressure range. The nonmolecular cubic-gauche (cg-N) structure was first observed above 110 GPa, coupled to high temperature (>2000 K) to overcome the kinetic barrier. A mixture of cg-N with a layered phase was afterwards reported between 120 and 180 GPa. Here, by laser heating pure nitrogen from 180 GPa, a sole crystalline phase is characterized above 240 GPa while an amorphous transparent phase is obtained at pressures below. X-ray diffraction and Raman vibrational data reveal a tetragonal lattice (P4(2)bc) that matches the predicted hexagonal layered polymeric nitrogen (HLP-N) structure. Density-functional theory calculations which include the thermal and dispersive interaction contributions are performed to discuss the stability of the HLP-N structure.
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页数:5
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