Response of liquid carbon disulfide to shock compression: Equation of state at normal and high densities

Abstract

Liquid carbon disulfide (CS2) is known to exhibit unusual behavior when it is shock compressed to pressures of approximately 6.0 GPa. This behavior has been explained by either a phase transition to a ‘‘black solid CS2 ’’ or a decomposition chemical reaction. In order to learn more about the anomalous behavior as it relates to a shock-induced chemical reaction, it was necessary to develop equations of state for both the unreacted liquid and the reaction products. This paper describes the development of these equations of state along with comparisons of calculated Hugoniot information to measured data available in the literature. Both equations are based on the use of a Murnaghan isotherm relation along with assumed forms for specific heat and the Gruneisen parameter. Methods employed to match the calculations to the data in order to establish the values of various adjustable parameters are detailed. Temperature calculations are included although there is some uncertainty as to their accuracy because of a lack of experimental temperature data.