Chin. Phys. Lett.  2020, Vol. 37 Issue (6): 068101    DOI: 10.1088/0256-307X/37/6/068101
CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
Evidence for a New Extended Solid of Nitrogen
Li Lei1,2**, Qi-Qi Tang1, Feng Zhang1, Shan Liu1, Bin-Bin Wu1, Chun-Yin Zhou3
1Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China
2Key Laboratory of High Energy Density Physics and Technology (Ministry of Education), Sichuan University, Chengdu 610064, China
3Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China
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Li Lei, Qi-Qi Tang, Feng Zhang et al  2020 Chin. Phys. Lett. 37 068101
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Abstract A new extended solid nitrogen, referred to as post-layered-polymeric nitrogen (PLP-N, or Panda-N), was observed by further heating the layered-polymeric nitrogen (LP-N) to above 2300 K at 161 GPa. The new phase is found to be very optically transparent and exhibits ultra-large $d$-spacings ranging from 2.8 to 4.9 Å at 172 GPa, suggesting a lower-symmetry large-unit-cell 2D chain-like or 0D cluster-type structure with wide bandgap. However, the observed x-ray diffraction pattern and Raman scattering data cannot match any predicted structures in the published literature. This finding further complicates the phase diagram of nitrogen and also highlights the path dependence of the high-pressure dissociative transition in nitrogen. In addition, the phase transition from cubic gauche nitrogen (cg-N) to LP-N is observed at 157 GPa and 2000 K.
Received: 14 February 2020      Published: 26 May 2020
PACS:  81.30.-t (Phase diagrams and microstructures developed by solidification and solid-solid phase transformations)  
  78.30.-j (Infrared and Raman spectra)  
  61.50.Ks (Crystallographic aspects of phase transformations; pressure effects)  
Fund: *Supported by the National Natural Science Foundation of China (Grant No. 11774247) and the Chinese Academy of Sciences (Grant No. 2019-SSRF-PT-009588).
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https://cpl.iphy.ac.cn/10.1088/0256-307X/37/6/068101       OR      https://cpl.iphy.ac.cn/Y2020/V37/I6/068101
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Li Lei
Qi-Qi Tang
Feng Zhang
Shan Liu
Bin-Bin Wu
Chun-Yin Zhou
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