Abstract
We have studied the diffusion mechanism in silica liquid following a new approach where the diffusion rate is estimated via the rate of SiO x \( \rightarrow\) SiO x±1 and the mean square displacement of Si particles per SiO x \( \rightarrow\) SiO x±1 . Molecular dynamics simulation has been conducted for a model consisting of 1998 particles over a wide range of temperatures (3000-4500K) and pressure (from 0 to 25.75GPa). Our results show that the rate of SiO x \( \rightarrow\) SiO x±1 increases either with increasing the temperature or pressure. Further, we find that SiO x \( \rightarrow\) SiO x±1 is heterogeneously distributed through the network structure of the liquid. In particular, it is concentrated on a small section of Si particles in a low-temperature regime and at ambient pressure. The spatial localisation of SiO x \( \rightarrow\) SiO x±1 originates from the fact that the stable unit in low- and high-pressure regime is SiO4 and SiO6 , respectively. The major change in the diffusion mechanism under pressure or temperature concerns the change in the distribution of SiO x \( \rightarrow\) SiO x±1 through the network structure. It is finally shown that the spatial localisation of SiO x \( \rightarrow\) SiO x±1 is responsible for the dynamics heterogeneity and the diffusion anomaly for silica liquid. This finding supports the concept that as the temperature approaches the glass transition point, SiO x \( \rightarrow\) SiO x±1 spatially localises such that the diffusivity drops and the dynamics are anomalously slow.
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Hung, P.K., Ha, N.T.T. & Hong, N.V. Computer simulation of diffusion in silica liquid under temperature and pressure. Eur. Phys. J. E 36, 60 (2013). https://doi.org/10.1140/epje/i2013-13060-9
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DOI: https://doi.org/10.1140/epje/i2013-13060-9