Molecular Dynamics Study of Li2SiO3in the Liquid and Glassy States

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Abstract
Molecular dynamics simulation (MD) has been carried out for Li2SiO3 in the molten and glassy states. The parameters of the pair potential functions were determined by a trial and error method so that the results of X-ray diffraction analysis could be well reproduced. The changes in the structure and dynamic properties accompanied by lowering temperature revealed that the glass transition of this simulated system occurred between 973 and 700 K. The ratio of the bridging oxygens to non-bridging oxygens was nearly constant over the investigated temperature range, while a small change in the pattern of branching of the -Si-O-framework was found. The second peaks in the pair correlation functions gSi-O(r) and gSi-Si(r) split at lower temperature. These splittings suggest that the motion changing the relative orientations of two neighboring SiO4 units may be nearly frozen at lower temperature.