Channel Formation and Intermediate Range Order in Sodium Silicate Melts and Glasses

A. Meyer, J. Horbach, W. Kob, F. Kargl, and H. Schober
Phys. Rev. Lett. 93, 027801 – Published 7 July 2004

Abstract

We use inelastic neutron scattering and molecular dynamics simulation to investigate the interplay between the structure and the fast sodium ion diffusion in various sodium silicates. With increasing temperature and decreasing density the structure factors exhibit an emerging prepeak around 0.9   1. We show that this prepeak has its origin in the formation of sodium rich channels in the static structure. The channels serve as preferential ion conducting pathways in the relative immobile Si-O matrix. On cooling below the glass transition this intermediate range order is frozen in.

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  • Received 8 December 2003

DOI:https://doi.org/10.1103/PhysRevLett.93.027801

©2004 American Physical Society

Authors & Affiliations

A. Meyer1,*, J. Horbach2,†, W. Kob3, F. Kargl1, and H. Schober4

  • 1Physik Department E 13, Technische Universität München, 85747 Garching, Germany
  • 2Institut für Physik, Johannes Gutenberg–Universität Mainz, 55099 Mainz, Germany
  • 3Laboratoire des Verres, Université Montpellier II, 34095 Montpellier, France
  • 4Institut Laue–Langevin, 38042 Grenoble, France

  • *Electronic address: ameyer@ph.tum.de
  • Electronic address: horbach@uni-mainz.de

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Vol. 93, Iss. 2 — 9 July 2004

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