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KIAM Preprint  100, Moscow, 2016
Authors: Vorobev V.S., Grushin A.S., Novikov V.G.
Investigation of the phase transitions in cesium by the average atom model
Using the average atom method (quasizone model) we show that the cesium cold curve has two minimums the first one is at relatively small densities 0.3 g/cm3 and the second one is at higher densities 6.2 g/cm3. The first one leads to the usual critical point characterizing the liquid-vapor phase transition, which is confirmed by experimental data. The reason for the second minimum is connected with s-d transition of valence electron. This leads to a second phase transition with the critical point at temperature 6400 K, density 5.3 g/cm3 and pressure approximately 61000 atm. This phase transition takes place in the cesium plasma state. In this degenerate nonideal plasma with mean ion charge 1.5 and density 3 g/cm3 jumps in a highly ionized state with mean charge of 3.5 and density 6.5 g/cm3.
equation of state, phase transition, physics of plasma, average atom model, cesium, nonideal plasma
Publication language: english, pages: 16
Research direction:
Mathematical modelling in actual problems of science and technics
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