Journal
PHYSICAL REVIEW B
Volume 64, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.64.134303
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We use classical molecular dynamics simulations to study the dynamics of sodium atoms in amorphous Na2O-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 is 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 to the dynamics of this system at high temperatures.
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