Molecular dynamics computer simulation of amorphous silica under high pressure

Details Molecular dynamics computer simulation of amorphous silica under high pressure Molecular dynamics computer simulation of amorphous silica under high pressure

2008-04-16

arxiv.org/abs/0804.2660v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

12 pages, 7 figures, to be published in J. Phys.: Condens. Matter

Scientific paper

10.1088/0953-8984/20/24/244118

The structural and dynamic properties of silica melts under high pressure are studied using molecular dynamics (MD) computer simulation. The interactions between the ions are modeled by a pairwise-additive potential, the so-called CHIK potential, that has been recently proposed by Carre et al. The experimental equation of state is well-reproduced by the CHIK model. With increasing pressure (density), the structure changes from a tetrahedral network to a network containing a high number of five- and six-fold Si-O coordination. In the partial static structure factors, this change of the structure with increasing density is reflected by a shift of the first sharp diffraction peak towards higher wavenumbers q, eventually merging with the main peak at densities around 4.2 g/cm^3. The self-diffusion constants as a function of pressure show the experimentally-known maximum, occurring around a pressure of about 20 GPa.

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