Contributions to the mixed-alkali effect in molecular dynamics simulations of alkali silicate glasses

Details Contributions to the mixed-alkali effect in molecular dynamics simulations of alkali silicate glasses Contributions to the mixed-alkali effect in molecular dynamics simulations of alkali silicate glasses

2005-06-15

arxiv.org/abs/cond-mat/0506380v1

Physics

Condensed Matter

Materials Science

10 pages, 12 figures, 1 table, revtex4, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.72.214202

The mixed-alkali effect on the cation dynamics in silicate glasses is analyzed via molecular dynamics simulations. Observations suggest a description of the dynamics in terms of stable sites mostly specific to one ionic species. As main contributions to the mixed--alkali slowdown longer residence times and an increased probability of correlated backjumps are identified. The slowdown is related to the limited accessibility of foreign sites. The mismatch experienced in a foreign site is stronger and more retarding for the larger ions, the smaller ions can be temporarily accommodated. Also correlations between unlike as well as like cations are demonstrated that support cooperative behavior.

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