Shock-Wave Compression of Nitrogen Fluid in the Pressure Range 140–250 GPa

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The results of a series of experiments on the shock compression of a dense nitrogen fluid, which is preliminarily statically compressed to an initial density ρ = 0.8, 0.65, and 0.5 g/cm3, to pressures of 140–230 GPa in hemispherical shock-wave generators are discussed. The experiments are carried out in continuation and development of the earlier series of experiments on the shock compression of liquid nitrogen to pressures of 100–330 GPa, which were performed at VNIIEF (Sarov) in 2008–2010. The purpose of our experiments is to verify and confirm the earlier revealed limiting compression of nitrogen to a limit close to an ideal gas (ρ/ρ0 ≈ 4.2) and the remarkable subsequent quasi-isochoric segment of the Hugoniot adiabat in the pressure range 100–330 GPa. The experimental data obtained are compared with the results of theoretical calculations performed with various models of the equation of state of a nonideal nitrogen plasma