STRUCTURE OF LEAD-SILICATE GLASSES VIA CONSTANT-PRESSURE MD SIMULATIONS

The structure of lead-silicate glasses xPbO(1 - x)SiO2, and reduced le ad-silicate glasses xPb(1 - x)SiO2 have been studied in a wide range o f compositions (0.1 < x < 0.9), using the molecular dynamics method. V arious radial distribution functions, and the first coordination numbe rs in their dependence on the glass stoichiometry are presented. The s hort-range structure in both reduced, and unreduced systems is discuss ed, and some conclusions about the long-range structure are mentioned. The calculated coefficients of the isothermal compressiblity, and of the isothermal expansion are compared to the experimental data.