Analysis of electrical conductivity measurements in strongly coupled tungsten and aluminum plasmas

Abstract

We study the influence of equation-of-state (EOS) model on the interpretation of electrical conductivity measurements in strongly coupled plasmas of tungsten [3] and aluminum [4]. Three different semiempirical EOS models for tungsten and aluminum are used. Multi-phase EOS model takes into account the melting, evaporation, and ionization effects; this EOS agrees with the collection of experimental data on static and shock compression as well as on adiabatic and isobaric expansion of metals. Caloric EOS model neglects phase transitions; however it describes available shock-wave experiments within a good accuracy. The soft-sphere EOS model considers evaporation of metals and has been calibrated using isobaric expansion experiments but does not take into account melting and gives understated density at normal temperature and pressure. Discrepancies in obtained thermodynamic parameters and resistivity values as compared with calculation results from [3,4] are analysed.