An infrared study of crystallization in sodium-disilicate glasses containing iron oxides

Investigating hydrogen storage behavior of CuMnO2glass-ceramic material

“…For figure 5a, the principle absorption frequencies can therefore be identified as follows: stretching peak at 3423 cm -1 is assigned for hydrogen, molecular water, silanol gp. Park and Chen [29] have associated this band with bending mode involving bridging oxygen and also the peak at 479 cm -1 presents the Si-O-Si and O-Si-O bending mode. Park and Chen [29] have associated this band with bending mode involving bridging oxygen and also the peak at 479 cm -1 presents the Si-O-Si and O-Si-O bending mode.…”

“…(Si-OH), broad peak at 2925 cm -1 is assigned for water, peak belongs to carbonate group at 1457 cm -1 , antisymmetric stretching of bridging oxygen within silicate tetrahedral appears at 1090 cm -1 , and the peak of Si-O-Si appears at 619 cm -1 . Park and Chen [29] have associated this band with bending mode involving bridging oxygen and also the peak at 479 cm -1 presents the Si-O-Si and O-Si-O bending mode. A comparison between Figures 5a and 5b reveals that some peaks appear in both figures.…”

FTIR, Raman, and UV-Vis spectroscopic and DFT investigations of the structure of iron–lead–tellurate glasses

“…The iron is present in glasses as Fe +2 and Fe +3 ions, both of which can exist in tetrahedral and octahedral sites [20][21][22][23][24][25]. Each redox and coordination state produces its own set of characteristic optical absorption bands.…”

“…Each redox and coordination state produces its own set of characteristic optical absorption bands. The majority of Fe +3 ions are believed to occupy tetrahedral network-forming sites in glasses, although this has been disputed [20][21][22][23].…”