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Intermediate Range Order in Silicate Melts and Glasses: Computer Simulation Studies

Published online by Cambridge University Press:  11 February 2011

Jürgen Horbach ,
Anke Winkler ,
Walter Kob  and
Kurt Binder
Jürgen Horbach
Affiliation:
Institut für Physik, Johannes Gutenberg–Universität, Staudinger Weg 7, D-55099 Mainz, Germany
Anke Winkler
Affiliation:
Institut für Physik, Johannes Gutenberg–Universität, Staudinger Weg 7, D-55099 Mainz, Germany
Walter Kob
Affiliation:
Laboratoire des Verres, Université Montpellier II, Place E. Bataillon, 34095 Montpellier, France
Kurt Binder
Affiliation:
Institut für Physik, Johannes Gutenberg–Universität, Staudinger Weg 7, D-55099 Mainz, Germany
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Abstract

We present the results of large scale computer simulations to discuss the structural and dynamic properties of silicate melts with the compositions (Na2O)(2·SiO2), (Na2O)(20·SiO2) and (Al2O3)(2·SiO2). We show that these systems exhibit additional intermediate range order as compared to silica (SiO2) where the characteristic intermediate length scales stem from the tetrahedral network structure. Furthermore we show that the sodium dynamics in the sodium silicate systems exhibits a very peculiar feature: the long–time decay of the incoherent intermediate scattering function can be described by a Kohlrausch law with a constant exponent β for q > qth whereby qth is smaller than the location of the main peak in the static structure factor for the Na–Na correlations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 754: Symposium CC – Supercooled Liquids, Glass Transition and Bulk Metallic Glasses , 2002 , CC8.2
Copyright
Copyright © Materials Research Society 2003

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References

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