Molecular dynamics simulations have been carried out on a silica glass containing 1 mol% soda. The Na distribution is not the same as that found in more highly concentrated sodium containing glasses. Long-range diffusive motion appears to be correlated with the absence of a neighboring non-bridging oxygen. Those Na ions remaining localized often show backward-forward hops that are not readily seen in glasses with larger sodium content. (C) 2003 Elsevier B.V. All rights reserved. [References: 9]
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