Common compression factor and bulk modulus quiescence points of liquid cesium

TL;DR

This study uses an analytical equation of state to identify specific quiescence points in the bulk modulus of liquid cesium, revealing two distinct liquid states with different structural characteristics.

Contribution

It applies a recently developed EOS to liquid cesium, identifying two quiescence points and correlating them with structural and interaction potential differences.

Findings

Two bulk modulus quiescence points in liquid cesium

Identification of two types of liquid cesium with distinct structures

Correlation with NMR and molecular dynamics results

Abstract

In this paper, a recently developed analytical equation of state (EOS) is used to investigate the bulk modulus of compressed liquid cesium and to locate common compression factor and the bulk modulus quiescence point(s). This EOS is applied quick well to Na and Rb far from Tc. Bulk modulus of liquid cesium have two quiescence points, a sharp one in the range 1100k-1500k and a diffused one in the range 1600k-1900k. Therefore, two types of liquid cesium metal may be identified with characteristic structure and interaction potential energy. It is a constant independent of temperature, however, some residual change is seen due to the change in the values of integral of pair correlation function as temperature is increased. Furthermore, it is related to the shape of the unit cell and the atomic size at equilibrium. Observation of distinct liquid in the metal-nonmetal transition range is compared with NMR studies and molecular dynamic results.