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We study the structural and dynamical characteristics of the sodium atomsinside and outside the ``diffusion channels'' in glassy Na$_2$O-4SiO$_2$ (NS4)using classical molecular dynamics. We show that on average neither energeticarguments nor local environment considerations can explain the increaseddensity of sodium atoms inside the subspace made of the channels. Neverthelesswe show that at low temperature the mean square displacement of the sodiumatoms inside this subspace is significantly larger than the one of the atomsoutside the channels.Comment: 6 pages, 6 figure

Characterization of channel diffusion in a sodium tetrasilicate glass via molecular-dynamics simulations