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A Low Frequency Study of the Vibrational Modes in Alkalisilicate Glasses by Raman Spectroscopy

Published online by Cambridge University Press:  10 February 2011

R. Sommer ,
J. Toulouse  and
H. Jain
R. Sommer
Affiliation:
Department of Physics, Lehigh University, Bethlehem, PA 18015
J. Toulouse
Affiliation:
Department of Physics, Lehigh University, Bethlehem, PA 18015
H. Jain
Affiliation:
Department of Materials Science and Engineering, Lehigh University, Bethlehem, PA 18015
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Abstract

We have performed a study on low frequency modes in several alkali silicate glasses by Raman spectroscopy. The Boson peak region is analyzed with a single parameter ω0 which is believed to characerize the density of states of the system. Analysis of the dependence of ω0 on the nature and concentration of the alkali suggests that the position of the Boson peak is essentially governed by the ratio “force constant” over “mass” of localized oscillator modes. At lower frequency (below 30 cm−1), the “excess” intensity can be explained by considering secondorder processes of the same vibrational modes, superimposed on other (possibly relaxational) modes.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 407: Symposium M – Disordered Materials and Interfaces-Fractals, structure and Dynamics , 1995 , 215
Copyright
Copyright © Materials Research Society 1996

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References

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