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Potassium disilicate glass and melt have been investigated by using a new partial charge based potential\udmodel in which nonbridging oxygens are differentiated from bridging oxygens by their charges. The model\udreproduces the structural data pertaining to the coordination polyhedra around potassium and the various\udbond angle distributions excellently. The dynamics of the glass has been studied by using space and time\udcorrelation functions. It is found that K ions migrate by a diffusive mechanism in the melt and by hops\udbelow the glass transition temperature. They are also found to migrate largely through nonbridging oxygenrich\udsites in the silicate matrix, thus providing support to the predictions of the modified random network\udmodel

Molecular Dynamics Investigation of Structure and Transport in the K2O-2SiO2 System Using a Partial Charge Based Model Potential