Characterizing Phase Transitions in Liquid Cesium by a Soft-core and Large Attractive Equation of State

Original · EN

This paper investigates to identify phase transitions in condensed liquid cesium metal by considering the variation of intermolecular potential parameters εand rₘ in the whole liquid range, with εbeing the potential well-depth and rₘ the position of minimum potential. These parameters were obtained from the parameters of a new equation of state that was derived recently by using the characteristic potential function. By this method, transitions at about 575 K, 800 K, 1000 K, 1350 K and 1650 K were identified. Transitions at 575 K, 800 K, and 1000 K are weak but, the one at 1350 K is very significant and has been explored experimentally and theoretically as the metal non-metal transition (MNMT), which is a phase transition before the critical condition dominates the thermodynamics. Also variations of the linear correlation coefficient of the isotherms generate a spot point pattern of these transitions. Our observations at 575 K for εand rₘ are in accord with the anomalies in adiabatic thermal coefficient of pressure, density, viscosity, electrical conductivity, and structure factor.