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. 2020 Jun 3;6(23):eaba9206. doi: 10.1126/sciadv.aba9206

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Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 4 — (A) Calculated enthalpies as functions of pressure for various structures of solid nitrogen with respect to CG-nitrogen. Pba2, C2/c, P4₂bc, and chain structures are reported in (12), (20), (13), and (19), respectively. “N₂” denotes the enthalpy of the molecular solid of N₂, calculated using the lowest-enthalpy structures (21) in respective pressure ranges. (B) Finite-temperature energy (H + Fvib) of BP-structured nitrogen relative to CG-nitrogen.