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Title: Ion transport pathways in molecular dynamics simulated alkali silicate glassy electrolytes
Authors: Prasada Rao, R. 
Tho, T.D.
Adams, S. 
Keywords: Bond valence approach
Ionic conductivity
Molecular dynamics simulations
Silicate glasses
Issue Date: 16-Jun-2011
Citation: Prasada Rao, R., Tho, T.D., Adams, S. (2011-06-16). Ion transport pathways in molecular dynamics simulated alkali silicate glassy electrolytes. Solid State Ionics 192 (1) : 25-29. ScholarBank@NUS Repository.
Abstract: The xM2O-(1 - x)SiO2 (M = Li, Na, and K, and 0.1 ≤ x ≤ 0.5) glass systems have been studied by constant volume molecular dynamics (MD) simulations. The bond valence (BV) method is applied to the equilibrated configurations to analyse the structural variation in these glass systems with increasing network modifier content, its consequence for M + ion mobility, as well as the distribution of bridging and non-bridging oxygen atoms and the variation of the Qi values. The contribution of non-bridging oxygen atoms to the BV sums exhibits a transition around x = 1/3 for Li2O and Na2O doped glasses. The observed Qi variation is consistent with a bond order model. Despite slight deviations of the interatomic distances in the MD-simulated glasses, their BV analysis reveals characteristic features of the ion transport pathway. For complex disordered systems with low ion mobilities the bond valence analysis of the pathway characteristics for the mobile ion is thus a viable method to extract ion transport properties even if the mobilities are too low to be directly analysed from the mean square displacements over the simulated period. © 2010 Elsevier B.V. All rights reserved.
Source Title: Solid State Ionics
ISSN: 01672738
DOI: 10.1016/j.ssi.2009.12.010
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