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Article Dans Une Revue Journal of Physics: Condensed Matter Année : 2003

Matrix controlled channel diffusion of sodium in amorphous silica

Résumé

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.

Dates et versions

hal-00122041 , version 1 (23-12-2006)

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E. Sunyer, P. Jund, R. Jullien. Matrix controlled channel diffusion of sodium in amorphous silica. Journal of Physics: Condensed Matter, 2003, 15, pp.L431-L437. ⟨hal-00122041⟩
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