Solid N2 was studied by energy‐dispersive x‐ray diffraction between 5.75 and 43.9 GPa at room temperature. The transition from δ‐N2 (Pm3n) to ε‐N2 (R3̄c) was observed at 16.3±0.5 GPa. The pressure‐volume curves for both phases were determined. A comparison with the results of a priori calculations shows good agreement up to ∼12 GPa, however, at higher pressures the theoretical isotherm becomes increasingly stiffer.
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