高压物理学报2024，Vol.38Issue(4)：44-53,10.DOI:10.11858/gywlxb.20240821
关于层状结构聚合氮存在性的探讨
On the Existence of Layered Polymeric Nitrogen
摘要
Abstract
Under the extreme conditions of high temperature and high pressure,molecular crystal nitrogen breaks the traditional three-bond mechanism and transforms into a single-bond polymerization state.The unique dissociation mechanism of nitrogen under high pressure makes the research significance of polymeric nitrogen beyond the scope of energetic materials,and also has profound scientific significance in the field of fundamental physics.Following the cubic gauche polymeric nitrogen cg-N(space group I213),the second experimentally discovered layered structure polymeric nitrogen LP-N(space group Pba2)has been controversial.The main problem is that,in addition to not being verified by other high-pressure X-ray diffraction experiments,LP-N structure has the similar synthesis temperature and pressure conditions and synthesis pathways,as well as almost the same Raman spectral characteristics as the subsequently discovered black phosphorus structure polymeric nitrogen BP-N(space group Cmca).The high-temperature and high-pressure synthesis of LP-N is likely to have a unique phase transition kinetic barrier.In this work,we started from the low-temperature solid-state molecular nitrogen λ-N2,used double-sided laser-heated diamond anvil cell(LHDAC)technology,combined with high-pressure X-ray diffraction based on the synchrotron radiation and high-pressure Raman scattering spectroscopy,supplemented by first-principles calculations,and observed the Pba2 structure of polymeric nitrogen LP-N at the conditions of about 141 GPa and about 2600 K.Combined with first-principles calculations,we compared and analyzed its pressure-dependent evolution of the volume per atom(p-V curve)and discussed the kinetic factors of LP-N synthesis at high temperature and high pressure.In addition to a more comprehensive understanding of LP-N,this paper further reveals the high-pressure path-dependent characteristics of polymeric nitrogen.关键词
聚合氮/高温高压/路径依赖/X射线衍射/拉曼散射Key words
polymeric nitrogen/high temperature and high pressure/path dependence/X-ray diffraction/Raman scattering分类
数理科学引用本文复制引用
刘静仪,吴彬彬,陶雨,蒲梅芳,周春银,雷力..关于层状结构聚合氮存在性的探讨[J].高压物理学报,2024,38(4):44-53,10.基金项目
国家自然科学基金(12374013,U2030107,11774247) （12374013,U2030107,11774247）
