Method of Studying the State of Condensed Substances Near the Cold Compression Curve at Extreme Pressures
V. A. Arinin1, A. O. Blikov1,2, I. A. Blinov1,2, A. B. Georgievskaya1,2, A. Yu. Gordeev1, N. B. Davydov1, A. V. Degtyarev1,2, S. V. Erunov1,2, V. N. Knyazev1, S. A. Korshunov1, E. V. Kulakov1, S. F. Manachkin1, A. B. Profe1, A. S. Pupkov1, R. V. Tilkunov1, B. I. Tkachenko1, O. A. Tyupanova1
1All-Russian Scientific Research Institute of Experimental Physics, Sarov, Russia
2Nizhny Novgorod State Technical University n.a. R.E. Alekseev, Nizhny Novgorod
Keywords: lead, spherical explosive device, quasi-isentropic compression, equation of state, cold compression curve, pressure, density
Abstract
A method for studying the quasi-isentropic compressibility of condensed substances was tested using an experiment with a lead shell. This method utilizes multi-frame radiography and explosive spherical loading devices with gas symmetrization. At maximum compression, the average density of the lead shell was ≈52.3 g/cm3, with a compression ratio of ≈4.6. The total pressure in the lead at maximum compression was ≈3.2 TPa, with the cold component equal to ≈94% and the thermal component ≈6%. The pressure values were obtained from a one-dimensional numerical calculation, which accurately describes the compression dynamics of the lead shell, using the ROSA-MI EOS for lead.
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