Route to high-energy density polymeric nitrogen t-N via He-N compounds
- Jiangsu Normal Univ., Xuzhou (China)
- Jilin Univ., Changchun (China); Univ. of Cambridge, Cambridge (United Kingdom)
- Carnegie Inst. of Washington, Washington, D.C. (United States)
- Univ. of Cambridge, Cambridge (United Kingdom); Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai (China)
- Deakin Univ., Waurn Ponds, VIC (Australia)
- Jilin Univ., Changchun (China)
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. As a result, this expands the known polymeric forms of nitrogen and indicates a route to its synthesis.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). Energy Frontier Research in Extreme Environments (EFree)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- NA0002006; SC0001057
- OSTI ID:
- 1470638
- Journal Information:
- Nature Communications, Vol. 9, Issue 1; Related Information: EFree partners with Carnegie Institution of Washington (lead); California Institute of Technology; Colorado School of Mines; Cornell University; Lehigh University; Pennsylvania State University; ISSN 2041-1723
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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