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Viscoelastic model for the dynamic structure of binary systems

Napoleon Anento·Luis E. Gonzalez·David J. Gonzalez·Yaroslav Chushak·Andriij Baumketner
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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 simulations data, leading to a good qualitative agreement, and showing the natural appearance in the model of the fast sound phenomenon.

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Napoleon Anento, Luis E. Gonzalez, David J. Gonzalez, Yaroslav Chushak, Andriij Baumketner. 2004-04-27. Viscoelastic model for the dynamic structure of binary systems. https://doi.org/10.1103/physreve.70.041201

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