Matrix controlled channel diffusion of sodium in amorphous silica

Details Matrix controlled channel diffusion of sodium in amorphous silica Matrix controlled channel diffusion of sodium in amorphous silica

2002-12-03

arxiv.org/abs/cond-mat/0212058v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

5 pages, 4 figures

Scientific paper

10.1088/0953-8984/15/26/102

To find the origin of the diffusion channels observed in sodium-silicate glasses, we have performed classical molecular dynamics simulations of Na$_2$O--4SiO$_2$ during which the mass of the Si and O atoms has been multiplied by a tuning coefficient. We observe that the channels disappear and that the diffusive motion of the sodium atoms vanishes if this coefficient is larger than a threshold value. Above this threshold the vibrational states of the matrix are not compatible with those of the sodium ions. We interpret hence the decrease of the diffusion by the absence of resonance conditions.

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