Structure and dynamics of SiO{sub 2} at very large positive and negative pressures

摘要: Molecular dynamics (MD) simulations for silica under large positive and negative pressures will be presented. Pressure-induced structural transformation the destruction of medium range order are studied in SiO{sub 2} glass density 2.2 to 4.3 g/cm3. Changes position height first sharp diffraction peak (FSDP), bond lengths, coordination numbers, angle distributions discussed. MD were also performed low (silica pressure) 0.1 Nature voids pore surface-to-volume ratio investigated. Calculated results fractal dimension small-angle neutron scattering data good agreement with available experiments.