Volume 67, Number 5, September 2004
|Page(s)||793 - 799|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 August 2004|
Experimental evidence for the bimodal character of the vibrational spectrum of Zintl-type liquids
Institute of Physics, Materials Research and Liquids, TU Chemnitz 09107 Chemnitz, Germany
Corresponding author: firstname.lastname@example.org
Accepted: 21 June 2004
Cold neutron inelastic scattering is used to study the atomic dynamics in liquid x alloys. In this binary system, the type of interaction can be varied continuously by changing the composition. Around equiatomic composition, where the influence of covalent bonds is expected to be largest, the vibrational spectrum is composed of two modes, one at low frequencies that is assigned to vibrations of the anions against the cations, and a high-frequency mode that is associated with the eigenfrequencies of covalently bonded - chains. The bimodal vibrational spectrum, observed for the first time in a Zintl-type system, is consistent with results from recent ab initio molecular-dynamics simulations.
PACS: 61.25.Mv – Liquid metals and alloys / 63.50.+x – Vibrational states in disordered systems / 61.12.Ex – Neutron scattering (including small-angle scattering)
© EDP Sciences, 2004
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