title: Viscoelastic model for the dynamic structure factors of binary systems.
abstract: This paper presents the viscoelastic model for the Ashcroft-Langreth dynamic structure factors of liquid binary mixtures. We also provide expressions for the Bhatia-Thornton dynamic structure factors and, within these expressions, show how the model reproduces both the dynamic and the self-dynamic structure factors corresponding to a one-component system in the appropriate limits (pseudobinary system or zero concentration of one component). In particular we analyze the behavior of the concentration-concentration dynamic structure factor and longitudinal current, and their corresponding counterparts in the one-component limit, namely, the self-dynamic structure factor and self-longitudinal current. The results for several lithium alloys with different ordering tendencies are compared with computer simulation data, leading to a good qualitative agreement, and showing the natural appearance in the model of the fast sound phenomenon.
authors.affiliation: Departament de Física Fonamental, Universitat de Barcelona, 08028 Barcelona, Spain.
authors.forename: N
authors.initials: N
authors.lastname: Anento
authors.forename: L E
authors.initials: LE
authors.lastname: González
authors.forename: D J
authors.initials: DJ
authors.lastname: González
authors.forename: Y
authors.initials: Y
authors.lastname: Chushak
authors.forename: A
authors.initials: A
authors.lastname: Baumketner