We report on a novel simultaneous observation of two inelastic doublets in the dynamic structure factor of the liquid alloy Li(30)Bi(70). This result establishes the coexistence of two density fluctuation modes in a liquid binary system with disparate mass components. The measurements of the dynamic structure factor of the alloy have been performed on the hot neutron three-axis spectrometer IN1 of the Institut Laue-Langevin with an unprecedented energy resolution in the small wave vector domain. Analysis of the dynamical parameters characterizing the two excitations reveals the acoustic nature of the low-frequency mode and suggests an optic-like nature for the high-frequency mode. A comparison with recent neutron scattering results on pure liquid Bi suggests that the low-frequency mode in the alloy is closely related to the heavier component dynamics.

Evidence for the coexistence of two density fluctuation modes in molten Li30Bi70 as probed by neutron scattering

PETRILLO, Caterina;SACCHETTI, Francesco
2007

Abstract

We report on a novel simultaneous observation of two inelastic doublets in the dynamic structure factor of the liquid alloy Li(30)Bi(70). This result establishes the coexistence of two density fluctuation modes in a liquid binary system with disparate mass components. The measurements of the dynamic structure factor of the alloy have been performed on the hot neutron three-axis spectrometer IN1 of the Institut Laue-Langevin with an unprecedented energy resolution in the small wave vector domain. Analysis of the dynamical parameters characterizing the two excitations reveals the acoustic nature of the low-frequency mode and suggests an optic-like nature for the high-frequency mode. A comparison with recent neutron scattering results on pure liquid Bi suggests that the low-frequency mode in the alloy is closely related to the heavier component dynamics.
2007
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11391/921354
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