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15 August 2020
 
  » arxiv » cond-mat/0305211

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Equilibrium phase behavior of polydisperse hard spheres
M. Fasolo ; P. Sollich ;
Date 9 May 2003
Journal Phys. Rev. Lett. 91, 068301 (2003) DOI: 10.1103/PhysRevLett.91.068301
Subject cond-mat
AbstractWe calculate the phase behavior of hard spheres with size polydispersity, using accurate free energy expressions for the fluid and solid phases. Cloud and shadow curves, which determine the onset of phase coexistence, are found exactly by the moment free energy method, but we also compute the complete phase diagram, taking full account of fractionation effects. In contrast to earlier, simplified treatments we find no point of equal concentration between fluid and solid or re-entrant melting at higher densities. Rather, the fluid cloud curve continues to the largest polydispersity that we study (14%); from the equilibrium phase behavior a terminal polydispersity can thus only be defined for the solid, where we find it to be around 7%. At sufficiently large polydispersity, fractionation into several solid phases can occur, consistent with previous approximate calculations; we find in addition that coexistence of several solids with a fluid phase is also possible.
Source arXiv, cond-mat/0305211
Other source [GID 389795] pmid12935114
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