Water-related IR absorption spectra for alkali zinc pyrophosphate glasses

Characterization of Nd3+-doped Tellurite Glasses with Low OH Content

“…The inset of the Figure 4 gives the IR absorption spectra of the TW and TW-4Nd glasses, prepared in both atmospheres, in the range of 2000 to 3600 cm -1 , which are associated with OH -absorption. The spectra of the glasses exhibit a broad absorption band centered at 3160 cm -1 (with a shoulder at ~3300 cm -1 ) and a weaker and sharper band between 2000 and 2400 cm -1 which are ascribed to the stretching mode of the weakly and strongly hydrogen-bonded Te-OH…O-Te groups, respectively 24,25 . The band around 3300 cm -1 is assigned to a combination of the free Te-OH groups and molecular water 25 .…”

Fluorotellurite glasses with improved mid-infrared transmission

“…The more intense band around 3000 cm À1 (3.5 lm) has previously been attributed to free-OH [6] and appears here to incorporate a higher wavenumber shoulder. It has been shown in alkali and alkaline earth silicates that the analogous band can be deconvoluted into several Gaussian spectral components [27]. For the tellurite and fluorotellurite glasses from Fig.…”

“…steam) Ernsberger [28] entrapped molecular water in alkali-silicate glasses, evidenced by the characteristic absorption band at 1600 cm À1 (fundamental bending mode) and a broader band around 3600 cm À1 which occurred in treated glasses. Two equilibria must be taken into account when considering hydrolysis of a glass melt [27] (where R is the main glass forming cation e.g. Si 4þ or Te 4þ ): (i) water vapour entering the melt as molecular water (i. .…”

“…Si 4þ or Te 4þ ): (i) water vapour entering the melt as molecular water (i. . Therefore the coexistence of these two equilibrium in the melt seems to suggest there is a non-zero concentration of molecular water in any glass with a non-zero water content [27].…”

Water-related bands in the IR absorption spectra of silicate glasses

“…Moreover, these bands promote a decrease in the quantum yield of luminescence, thus diminishing the efficiency of light generation by laser glasses (see, for example, [2]). There is yet a substantial controversy about data available [3][4][5][6][7][8][9][10][11][12][13][14][15] on the total number of such bands depending on glass matrix composition and particular kinds of the corresponding water-related species. So, a further insight into the nature of the water-related spectra of glasses remains of importance for the glass industry.…”