The polymerization of nitrogen in Li2N2 at high pressures.
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ABSTRACT: The polymerization of nitrogen can be used as high energy density materials. The crystal structures of Li2N2 at high pressures are explored by using the first-principles method combined with evolutionary algorithm. The phase transitions Pmmm → Immm → Pnma → Cmcm-1 → I41/acd are predicted in the pressure range of 0-300 GPa. Enthalpy calculations reveal that the tetragonal phase I41/acd containing the spiral nitrogen chains is stable above 242 GPa, indicating that the polymerization of nitrogen is realized in Li2N2 under pressure.
SUBMITTER: Zhang J
PROVIDER: S-EPMC6120935 | biostudies-literature |
REPOSITORIES: biostudies-literature
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