Prog. Theor. Phys. Supplement No.138 (2000) pp. 211-216
Fast and Slow Dynamics in Metasilicate Glasses
1 Tokyo Institute of Technology, Nagatsuta 4259, Yokohama 226-8502, Japan
2 Kanazawa University, Kanazawa 920-1192, Japan
(Received October 11, 1999)
Molecular dynamics (MD) simulations of lithium
metasilicate (Li2SiO3) glass has been performed. Dynamics of
lithium ions in metasilicate glass were found to divide into fast
and slow ones in the glassy state. We have divided the particles into type A
(slow dynamics) and B (fast dynamics).
We have examined the characteristics of the dynamics and structure
with distinguishing between type A and B particles.
Type A particles are located within
neighboring sites during a 1 ns run. Such particles show only single
jumps and tend to return to their previous sites due to low
dimensional local paths.
The particles with long waiting time of the jump motion is also
included type A particles.
On the other hand, type B particles show accelerated dynamics.
Cooperative jumps (simultaneous jumps of neighboring ions or
several ps before the relaxation of the jump sites) cause
the acceleration. Power law distributions of the
displacements reveal that the fast dynamics is characterized as
Lévy flight. Short intervals of the jump events also take place
in the fast dynamics at short time region. We have found the
difference in the medium range structure concerning type A and B
particles. The structure for type B particles seems to be favorable
to cause the cooperative jumps.
DOI : 10.1143/PTPS.138.211
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Citing Article(s) :
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