Structural transformation in densified silica glass: A molecular-dynamics study

Molecular dynamics study of UV-laser-induced densification of fused silica. II. Effects of laser pulse duration, pressure, and temperature, and comparison with pressure-induced densification

“…The microstructural changes in silica glass under high pressure have been extensively studied, both experimentally [17][18][19][20][21][22] and using molecular dynamics simulations [23][24][25][26][27][28][29][30]. The first sharp diffraction peak in the X-ray or neutron static structure factor of silica glass was observed to shift to larger scattering factor q and decrease in its magnitude with increasing glass density.…”

UV-laser-induced densification of fused silica: a molecular dynamics study

“…Many studies have been dedicated to understanding the microstructural properties [12][13][14][15] and pressure-induced densification [16][17][18] on how UV-laser irradiation causes densification in fused silica and how laser irradiation affects its properties. Kubota et al [19] used shock waves to model laser pulses to achieve densification of up to 20% in fused silica.…”

Theoretical study of a five-coordinated silica polymorph

“…4,5,[13][14][15][16] Although all of the observed stable and metastable crystalline phases of silica consist of either IV Si or VI Si, there has been great interest in the possibility of forming phases in which silicon has fivefold coordination by oxygen ( V Si). This species has been predicted in theoretical studies of the effects of pressure and temperature on silicate melts and glasses [17][18][19][20][21][22][23][24][25][26][27] and inferred experimentally by 29 Si NMR and vibrational spectroscopy in alkali silicate liquids and glasses. 16,[28][29][30][31][32][33][34][35][36] Silicon has also been found in fivefold coordination with oxygen in a number of organosilicon compounds.…”