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Lattice Dynamics and Network Dynamics Calculations on Vibrational Modes of Lithium Borate Glasses

Published online by Cambridge University Press:  28 February 2011

J. Deppe ,
M. Balkanski ,
R. F. Wallis  and
M. Massot
J. Deppe
Affiliation:
Physics Department, University of California, Irvine Irvine, California 92717
M. Balkanski
Affiliation:
Laboratoire de Physique des Solides, CNRS 154, Université Pierre et Marie Curie, 4 Place Jussieu, 75252 Paris Cédex 05, France
R. F. Wallis
Affiliation:
Physics Department, University of California, Irvine Irvine, California 92717
M. Massot
Affiliation:
Laboratoire de Physique des Solides, CNRS 154, Université Pierre et Marie Curie, 4 Place Jussieu, 75252 Paris Cédex 05, France
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Abstract

The central force nearest neighbor model for glasses is used to discuss the Raman and infrared vibrational data for the family of lithium doped borate glasses B2O3 - xLi2O. The addition of the dopant is shown to cause local structural changes, including the transformation of three-coordinated borons to four-coordinated ones. An extremely simple structural model for the glass gives good qualitative agreement with experiment. The results of lattice dynamics calculations fall within the allowed frequency band limits predicted by network dynamics. The success of this model illustrates the importance of short range order on the vibrational spectra of covalently bonded solids.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 210: Symposium L – Solid State Ionics II , 1990 , 125
Copyright
Copyright © Materials Research Society 1991

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