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: email@example.com
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.