Volume 54, Number 1, April 2001
|Page(s)||77 - 83|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 December 2003|
Contrasting behaviour of acoustic modes in network and non-network glasses
Department of Applied Physics,
Chalmers University of Technology S-412 96 Göteborg, Sweden
2 Università di L'Aquila and INFM - I-67100, L'Aquila, Italy
3 European Synchrotron Radiation Facility - B.P. 220 F-38043 Grenoble Cedex, France
Corresponding author: firstname.lastname@example.org
Accepted: 25 January 2001
High-frequency acoustic excitations have been investigated in typical network and non-network glasses, and 1.4 (CKN) using inelastic X-ray scattering. CKN exhibits linear dispersion of the excitations throughout the investigated range (1-8) and to energies more than five times above the boson peak energy. For we observe for the first time a clear crossover in the dispersion relation just above the boson peak. The contrasting behaviour is attributed to differences in connectivity and fluctuations of force constants on a mesoscopic length scale.
PACS: 63.50.+x – Vibrational states in disordered systems / 61.10.Eq – X-ray scattering (including small-angle scattering) / 78.70.Ck – X-ray scattering
© EDP Sciences, 2001
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