Table 1 Silica variants. Main categories of investigated silica systems, identified by production method (first column) and perturbation level of the structural network, from nominally pure parent samples (second column) to samples conditioned by doping (third column) or by treatment-induced defects (forth column)
Undoped | Doped | Defective | |
|---|---|---|---|
Silica by solution-processing route | Pure sol-gel silica (u-spr) | Sn-doped sol-gel silica (s-spr) | Silicon-rich sol-gel silica (d-spr) |
Silica by chemical vapour deposition | Pure CVD silica (u-cvd) | Ge-doped CVD silica (g-cvd) | n-irradiated CVD silica (n-cvd) |
