Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 353, Issue 32-40, Pages 3139-3144Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnoncrysol.2007.05.047
Keywords
acoustic properties and phonons; liquid alloys and liquid metals; diffraction and scattering measurements; modeling and simulation
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The dynamic structure factor S(Q, omega) of liquid Bi was measured at 580 K in the Q range from 0.15 to 0.6 angstrom(-1) using inelastic neutron scattering. The obtained spectra clearly demonstrate the existence of well defined longitudinal propagating modes. A positive dispersion is found in the low Q region, where the mode velocity undergoes a transition between the hydrodynamic value and a high frequency value 20% larger. The damping of the excitations does not follow the hydrodynamic Q(2) trend and is stronger than in any metallic liquid investigated so far. The quasielastic lineshape contains a broad Q-independent Lorentzian contribution, other than a small sharp peak, which has yet been observed in liquid Hg and Ga. (c) 2007 Elsevier B.V. All rights reserved.
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