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To find the origin of the diffusion channels observed in sodium-silicateglasses, we have performed classical molecular dynamics simulations ofNa$_2$O--4SiO$_2$ during which the mass of the Si and O atoms has beenmultiplied by a tuning coefficient. We observe that the channels disappear andthat the diffusive motion of the sodium atoms vanishes if this coefficient islarger than a threshold value. Above this threshold the vibrational states ofthe matrix are not compatible with those of the sodium ions. We interpret hencethe decrease of the diffusion by the absence of resonance conditions.Comment: 5 pages, 4 figure

Matrix-controlled channel diffusion of sodium in amorphous silica