Equation of State of Argon, Krypton and Xenon Taking into Account Evaporation and Ionization
A. B. Medvedev
All-Russian Scientific Research Institute of Experimental Physics, Sarov, Russia
Keywords: argon, krypton, xenon, liquid, gas, equation of state, van der Waals model, density, pressure, temperature, isotherm, shock adiabat, evaporation, ionization
Abstract
Wide-range semiempirical equations of state for liquid and gaseous argon, krypton, and xenon are constructed, taking into account evaporation and thermal ionization, based on a modified van der Waals model for mixed substances. The empirical functions that specify the model have a simple form. They contain a small number of free parameters, selected based on the best possible description of the experimental data. A comparison of the model calculation results with experiment up to pressures of ≈1000 GPa and the results of calculations using other models at pressures above 1000 GPa is presented. In the limit of low density and high temperature, the model transforms into an equation of state for a mixture of ideal gases of atoms, ions of all multiplicities, and electrons with a concentration determined by the Saha system of equations.
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