The dynamics of sodium in sodium disilicate: Channel relaxation and sodium diffusion

Details The dynamics of sodium in sodium disilicate: Channel relaxation and sodium diffusion The dynamics of sodium in sodium disilicate: Channel relaxation and sodium diffusion

2001-10-16

arxiv.org/abs/cond-mat/0110325v1

Physics

Condensed Matter

Statistical Mechanics

9 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.88.125502

We use molecular dynamics computer simulations to study the dynamics of amorphous (Na_2O)2(SiO_2). We find that the Na ions move in channels embedded in a SiO_2 matrix. The characteristic distance between these channels gives rise to a prepeak in the structure factor at around q=0.95 A^-1. The dynamics of sodium is given by a fast process which can be seen in the incoherent scattering function and a slow process which is seen in the coherent function. The relaxation time of the latter coincides with the alpha-relaxation time of the matrix. The Kohlrausch exponent of the fast process for q>1.6 A^1 is the same as the von Schweidler exponent for the slow one, demonstrating that the two processes are closely related.

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