Infrared and Raman Spectroscopic Study of Glasses in the Al₂O₃-B₂O₃-Fe₂O₃-Na₂O-SiO₂ System

Abstract

Glasses in the Al2O3-B2O3-Fe2O3-Na2O-SiO2 system were produced at a temperature of 1150 °C, poured onto a metal plate and annealed. The nature of the structural units and their bonding in the structure were studied by infrared and Raman spectroscopic techniques. The structural network of all the glasses studied is built from major [SiO 4 ] tetrahedra with 2-3 non-bridging oxygens (NBO). Incorporation of Fe2O3 offers a destructive effect in the glass network.

Spectroscopic study of partially oxidized BN nanoscrolls induced by low frequency ultrasonic irradiation

“…At the current stage of our study, we could not identify the other minor peaks. The peaks at 1247 and 1323 cm −1 were previously attributed to vibrations in BO 3 structural units in boron containing glasses [30], which is consistent with our XPS analysis. Previous reports suggest that the weak peaks around the main peaks are related to the uneven distribution of B or N vacancies owing to substitutional impurities in BN [31].…”

XAFS Study of Fe K Edge in Al2O3-B2O3-Fe2O3-Na2O-SiO2 Glasses

“…Fe2O3 and Fe 3+ ions in borosilicate glasses play a role similar to Al2O3 and Al 3+ ions by interfering conversion of III B to IV B. As a result, even at high R and K values, occurrence of Fe 3+ ions in glasses reduces fraction of B 3+ ions in tetrahedral coordination and maintains significant amount of [BO 3 ] units in the glass structure as it is seen from infrared and Raman spectroscopic data [19].…”

“…XRD and SEM characterization showed that the A1 and D1 materials were fully amorphous whereas the B1 material contained a minor content of carnegieite crystals (Na1.13Al0.75Fe0.22Si0.99O4.00) and a very low concentration of magnetite-type spinel crystals [18,19]. Due to the low content of these phases in the B1 glass their effect on Fe partitioning is negligible and the majority of Fe in the glass enters the vitreous phase similar to the A1 and D1 glasses.…”

“…In our paper [19] we described and discussed IR and Raman spectra of the A1, B1 and D1 glasses. We found weak absorption at ~575-595 cm -1 in IR spectra of all three glasses which may be attributed to vibrations of Fe 3+ ⎯O bonds in [Fe 3+ O4] tetrahedra.…”

“…The target and measured chemical compositions of the glasses are given in Table I. The glasses were characterized by X-ray diffraction, electron microscopy, infra-red (IR) and Raman spectroscopy in our previous studies [18,19]. X-ray absorption fine structure (XAFS) spectra were recorded at the Structural Materials Science (STM) beamline of the synchrotron source at NRC "Kurchatov Institute" [20].…”