Infrared spectra of aluminogermanate- and aluminate-sodalites and a re-examination of the relationship between TO bond length, TOT angle and the position of the main i.r. absorption band for compounds with framework structures

A comparative study of two methods to produce geopolymer composites from volcanic scoria and the role of structural water contained in the volcanic scoria on its reactivity

“…After the fusion process, this peak shift to the lower wavenumber (975 cm -1 for fZ G and 985 cm -1 for fZ K ). This indicates that the substitution of Al into a tetrahedra silicate network is increased; there is an increase in bond length and angle [18,19].…”

“…This absorption band appears at around 1018 cm -1 on the FTIR spectrum of GZ G . A shift to a lower wavenumber indicates the formation of Alrich geopolymeric gels resulting from the substitution of Si atoms by Al in IV-fold coordination, there is also an increase in bond length and angle [18,19]. According to Hyunsoo [20], this observation was assigned to the increase in non bridging oxygen (NBO) content arising from depolymerisation in the volcanic scoria.…”

The stability of sodalite in the system NaAlSiO4-NaCl

“…The calculated dP/dT of this with other data on Cl-bearing sodalites. Structure refinements reaction (70 bar/K) determined with available thermody-(LONS and SCHULZ, 1967; PETERSON, 1983) and infrared namic data is poorly constrained because of the small AI' studies (HENDERSON and TAYLOR, 1979) of sodalite are and AS for this reaction and the uncertainties in the high-consistent with total or near-total order of Al-St A 29Si nuclear temperature thermodynamic data for y-nepheline and car-magnetic resonance study on the Mont St-Hilaire sodalite negieite. However, a consistent set of thermodynamic data equilibrated at 1123 K/6 kbar was performed by D. A. Howell in the Laboratory of Dr. J. R. Kirkpatrick at the University of Illinois, Urbana, and it shows no signs of Al-S1 disorder (D. Howell, pets.…”

Lead Hydro Sodalite [Pb2(OH)(H2O)3]2[Al3Si3O12]2: Synthesis and Structure Determination by Combining X-ray Rietveld Refinement,1H MAS NMR FTIR and XANES Spectroscopy

“…[19,20] The bands below 1200 cm À1 are framework vibrations typical of aluminosilicate sodalites. [21] XANES spectroscopy: A high-intensity peak in the spectrum of PbO 2 at 13.025 keV (Figure 8) is attributed to a dipoleallowed electronic transition from a filled 2p orbital of the Figure 8. The second derivative of the PbL 3 edge XANES spectrum of lead hydro sodalite, with the second derivatives of the spectra of some lead ± oxygen compounds, taken as references for lead in different valence states and coordination environments.…”