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Title: Liquid-liquid phase transition for an attractive isotropic potential with wide repulsive range
Author: Malescio, Gianpietro
Franzese, Giancarlo
Skibinsky, Anna
Buldyrev, V. S. (Vladimir Sergeevich)
Stanley, H. Eugene (Harry Eugene), 1941-
Keywords: Cristal·lografia
Equacions d'estat
Equations of state
Issue Date: 2005
Publisher: The American Physical Society
Abstract: We investigate how the phase diagram of a repulsive soft-core attractive potential, with a liquid-liquid phase transition in addition to the standard gas-liquid phase transition, changes by varying the parameters of the potential. We extend our previous work on short soft-core ranges to the case of large soft-core ranges, by using an integral equation approach in the hypernetted-chain approximation. We show, using a modified van der Waals equation we recently introduced, that if there is a balance between the attractive and repulsive part of the potential this potential has two fluid-fluid critical points well separated in temperature and in density. This implies that for the repulsive (attractive) energy U R ( U A ) and the repulsive (attractive) range w R ( w A ) the relation U R ∕ U A ∝ w R ∕ w A holds for short soft-core ranges, while U R ∕ U A ∝ 3 w R ∕ w A holds for large soft-core ranges.
Note: Reproducció del document publicat a:
It is part of: Physical Review E, 2005, vol. 71, núm. 6, p. 061504-1-061504-8
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ISSN: 1063-651X
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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