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

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

2004-01-09

arxiv.org/abs/cond-mat/0401152v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.93.027801

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 A^-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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