Channel diffusion of sodium in a silicate glass

Details Channel diffusion of sodium in a silicate glass Channel diffusion of sodium in a silicate glass

2001-01-05

arxiv.org/abs/cond-mat/0101055v2

Phys. Rev. B 64, 134303 (2001)

Physics

Condensed Matter

Statistical Mechanics

10 pages of Latex, 5 figures, one figure added, text expanded

Scientific paper

10.1103/PhysRevB.64.134303

We use classical molecular dynamics simulations to study the dynamics of sodium atoms in amorphous Na$_2$O-4SiO$_2$. We find that the sodium trajectories form a well connected network of pockets and channels. Inside these channels the motion of the atoms is not cooperative but rather given by independent thermally activated hops of individual atoms between the pockets. By determining the probability that an atom returns to a given starting site, we show that such events are not important for the dynamics of this system.

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