Diffusional Anomaly and network dynamics in liquid silica

Details Diffusional Anomaly and network dynamics in liquid silica Diffusional Anomaly and network dynamics in liquid silica

2006-07-18

arxiv.org/abs/cond-mat/0607441v1

Physics

Condensed Matter

Soft Condensed Matter

30 pages, 9 figures

Scientific paper

10.1063/1.2219113

The present study applies the power spectral analysis technique to understand the diffusional anomaly in liquid silica, modeled using the BKS potential. Molecular dynamics simulations have been carried out to show that power spectrum of tagged particle potential energy of silica shows a regime with 1/f dependence on frequency f which is the characteristic signature of multiple time-scale behaviour in networks. As demonstrated earlier in the case of water (J. Chem. Phys., 122, 104507 (2005)), the variations in the mobility associated with the diffusional anomaly are mirrored in the scaling exponent alpha associated with this multiple time-scale behaviour. Our results indicate that in the anomalous regime, as the local tetrahedral order decreases with temperature or pressure, the coupling of local modes to network reorganisations increases and so does the diffusivity. This symmetry-dependence of the vibrational couplings is responsible for the connection between the structural and diffusional anomalies.

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