Rapid Flame Photometric Determination of Alkalies in Glasses and Silicates

Optical properties of Yb3+-doped phosphate laser glasses

“…As can be seen from the FTIR spectra, there is one broad absorption band at around 3440 and 3570 cm −1 for the PKSAYb01 and the PKSAYb60 glasses, respectively. This band is ascribed to the stretching of the OH − vibrations [42]. The previous study in sodium silicate glasses [43] showed that the OH − absorption bands in oxide glasses can be classified into three groups, the free OH − groups at 3500 cm −1 , the strongly hydrogen-bonded OH − groups at 2650 cm −1 and the very strongly hydrogen-bonded OH − groups at 2300 cm −1 .…”

“…The free OH − group present in the glasses is associated in the network of the glass former through hydrogen bonding [42]. The free OH − content and N OH (ions/cm 3 ) in the Yb 3+ -doped PKSAYb glasses has been estimated from the measured FTIR spectra [44,45] and is found to be around 9.9 × 10 21 ions/cm 3 for the PKSAYb01 and around 12.8 × 10 21 ions/cm 3 for the PKSAYb60 glasses, respectively.…”

Fluorotellurite glasses with improved mid-infrared transmission

“…Adams found that association of OH groups through hydrogen-bonding in silicate glasses produces three effects on infrared OH absorption bands [24]:…”

Effect of hydroxyl groups on Er3+-doped bismuth-borate glass and fiber

“…In the oxide glasses, these absorption bands originate from the stretching vibration of OH À groups [9], of which the 3300 cm À1 absorption is ascribed to the free OH À groups, and the 2550 and 2200 cm À1 absorptions are ascribed to the strongly hydrogen-bonded OH À groups. Because of the various sites of OH À groups in the vitreous host and the highly disordered hydrogen-bonded OH À groups, the absorption bands become quite broad [10]. It is also considered that at least a part of the OH À groups is combined with Bi because the frequencies of peak absorption in the bismuth-based glasses are smaller than that in the silica glass [11].…”