Pressure stabilized polymeric nitrogen in N2F and N10F compounds

Pressure stabilized polymeric nitrogen in N2F and N10F compounds
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N2F 和 N10F 化合物中的压力稳定聚合氮

DOI:
10.1016/j.rinp.2022.106093
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发表时间:
2022-12
期刊:
影响因子:
5.3
通讯作者:
Yinwei Li
Yinwei Li
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Shuyi Lin;Meiling Xu;Jian Hao;Yinwei Li

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聚合氮具有室温淬火恢复能力,被认为是最强大的绿色高能量密度材料,引起了人们的广泛关注。本文采用结构搜索和第一性原理计算相结合的方法,预测了两种化学计量比分别为N2 F和N10 F的富氮氟化合物。N2 F和N10 F分别在67-110 GPa和87-110 GPa下相对于ε-N和氟是热力学稳定的。N2 F和N10 F都包含N6环,通过共边形成一维N∞带,通过共边和两个N原子桥连形成三维通道状开放骨架.声子谱计算和分子动力学模拟表明,这两个预测相的环境压力淬火恢复。有趣的是,在N10 F中从开放通道中去除F原子后,聚合氮骨架mC 10-N在环境条件下以11.20 kJ/g的能量密度保留,使其成为显著的高能量密度材料。
Polymeric nitrogen possessing ambient quench recoverability is considered to be the most powerful and green high-energy density material, which has triggered extensive interest. Herein, we predicted two hitherto unknown nitrogen-rich nitrogen fluorine compounds with stoichiometries N2F and N10F using structure searching method and first-principles calculations. N2F and N10F are thermodynamically stable relative to ε-N and fluorine at 67–110 and 87–110 GPa, respectively. Both N2F and N10F encompass N6rings, forming one-dimensional N∞ribbons by edge-sharing and three-dimensional channel-like open framework by edge-sharing and two N atoms-bridging, respectively. Phonon spectra calculations and molecular dynamics simulations demonstrate the ambient-pressure quench recoverability of the two predicted phases. Interestingly, after the removal of F atoms from open channel in N10F, the polymeric nitrogen frameworkmC10-N is retained at ambient conditions with the energy density of 11.20 kJ/g, rendering it a remarkable high-energy density material.
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发表时间: 2022-01-20
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