Interpretation of the Infrared Spectra of Fused Silica

Abstract

69and large quantities of the calcium silicates. Surveys by Suzuki and NishP and by Taplinz3 indicate that other factors must be involved. For example, glycol aldehyde, glyceraldehyde, glycolic acid, and ketomalonic acid strongly retard cement setting, but are only weak retarders, or even accelerators, of C A hydration.' Previous work on the CA-gypsum reaction' showed that sugars have a retarding effect, but not enough data were available to determine if the conversion from the trisulfate sulfoaluminate to the monosulfate sulfoaluminate were affected. However, since organic compounds can affect the reactivity of hexagonal hydrates, it is feasible that such additives could have an important influence on subsequent reactions of C,A under conditions of sulfate attack. R:ferences

Mechanical and leaching properties of neodymium‐contaminated soil glass‐ceramics

“…To understand the changing of microstructure, FT‐IR result of the sample N sintered at 1300℃ was fitted by Gaussian profile and results were shown in Figure 4. Five coordination modes of silicon with different terminal oxygen were reported: 35,36 the orthosilicates (SiO 4 4− ) at ~850 cm −1 , the pyrosilicate groups (Si 2 O 7 6− ) at ~900 cm −1 , the chain silicates (Si 3 O 9 6− ) in the range of 950‐1000 cm −1 , and the sheet silicates (Si 4 O 11 6− ) in the range of 1050‐1100 cm −1 , which was described as Q 0 , Q 1 , Q 2 , and Q 3 , respectively. Q 4 showed part of infrared activity.…”

Vibrational Properties of Non‐Crystalline Solids

“…Specifically, the bond-bending force constant a t the bridging oxygen atoms in Si0, is one order of magnitude smaller than the 0-Si-0 bond-bending force constant a t the Si atoms, and two orders of magnitude smaller than the Si-0 bond-stretching force constant. The GF-matrix method has been applied to calculate vibrational frequencies of vitreous SiO, by Gaskell [82] using a p-cristobalite lattice model, by Bock and Su [81] using an a-quartz lattice model, and by Bates [83] using a @-quartz lattice model.…”

Spectroscopic characterization of alkali borosilicate glasses containing iron ions

“…Bock and Gouq-Jen Su [11] made a comparison of observed and calculated vibrational spectra for vitreous silica. The infrared spectrum recorded for vitreous silica was characterized with bands at 377, 465, 800, 950, 1100 and 1190 cm-1.…”