On Evaporation of Iron after Impact Compression
A. B. Medvedev
RFNC, All-Russian Research Institute of Experimental Physics, Sarov, 607188 Russia
Keywords: iron, equation of state, pressure, temperature, density, entropy, shock compression, isentropic unloading, evaporation, speed, impact, Earth
Abstract
The previously developed wide-range multiphase equation of state of Fe was used to calculate the shock pressure causing its evaporation during isentropic unloading up to 10-4 GPa (1 atm). Calculations were made for three initial states of matter: pressure 1 atm and temperature 298 K (“cold” initial state), 1 GPa and 1 500K (“warm” state), and 40 GPa and 4 000 K (“hot” state). The shock pressure is 359, 261, and 132 GPa, respectively. These values are generally lower than the estimates of other authors. Arguments are given in their justification.
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