Evidence for a High-Pressure Isostructural Transition in Nitrogen
Chunmei Fan1 , Shan Liu1 , Jingyi Liu1 , Binbin Wu1 , Qiqi Tang1 , Yu Tao1 , Meifang Pu1 , Feng Zhang1 , Jianfu Li2 , Xiaoli Wang2* , Duanwei He1 , Chunyin Zhou3 , and Li Lei1*
1 Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China2 School of Opto-Electronic Information Science and Technology, Yantai University, Yantai 264005, China3 Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China
Abstract ：We observed an isostructural phase transition in the solid nitrogen $\lambda$-N$_{2}$ at approximately 50 GPa accompanied by anomalies in lattice parameters, atomic volume and Raman vibron modes. The anomalies are ascribed to a slight reorientation of the nitrogen molecules, which does not seem to affect the monoclinic symmetry (space group $P2_{1}/c$). Our ab initio calculations further confirm the phenomena, and suggest an optimized structure for the $\lambda$-N$_{2}$ phase. In addition, a new high-pressure amorphous phase of $\eta '$-N$_{2}$ was also discovered by a detailed investigation of the pressure-temperature phase diagram of nitrogen with the aim of probing the phase stability of $\lambda$-N$_{2}$. Our result may provide helpful information about the crystallographic nature of dissociation transitions in diatomic molecular crystals (H$_{2}$, O$_{2}$, N$_{2}$, etc).
收稿日期: 2022-01-05
Express Letter
出版日期: 2022-01-23
引用本文:
. [J]. 中国物理快报, 2022, 39(2): 26401-026401.
链接本文:
https://cpl.iphy.ac.cn/CN/10.1088/0256-307X/39/2/026401
或
https://cpl.iphy.ac.cn/CN/Y2022/V39/I2/26401
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2022, Vol. 39 
