Route to high-energy density polymeric nitrogen t-N via He-N compounds.
Route to high-energy density polymeric nitrogen t-N via He-N compounds.
复制标题
通过He-N化合物制备高能量密度聚合氮t-N的路线
DOI:
10.1038/s41467-018-03200-4
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发表时间:
2018-02-19
影响因子:
16.6
通讯作者:
Ma Y
中科院分区:
文献类型:
--
作者:
Li Y;Feng X;Liu H;Hao J;Redfern SAT;Lei W;Liu D;Ma Y
Polymeric nitrogen, stabilized by compressing pure molecular nitrogen, has yet to be recovered to ambient conditions, precluding its application as a high-energy density material. Here we suggest a route for synthesis of a tetragonal polymeric nitrogen, denoted t-N, via He-N compounds at high pressures. Using first-principles calculations with structure searching, we predict a class of nitrides with stoichiometry HeN4 that are energetically stable (relative to a mixture of solid He and N2) above 8.5 GPa. At high pressure, HeN4 comprises a polymeric channel-like nitrogen framework filled with linearly arranged helium atoms. The nitrogen framework persists to ambient pressure on decompression after removal of helium, forming pure polymeric nitrogen, t-N. t-N is dynamically and mechanically stable at ambient pressure with an estimated energy density of ~11.31 kJ/g, marking it out as a remarkable high-energy density material. This expands the known polymeric forms of nitrogen and indicates a route to its synthesis.
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