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Solid‐state NMR Evidence of 4‐, 5, and 6‐Fold Aluminum Sites in Roller‐Quenched SiO 2 ‐A1 2 O 3 Glasses
Author(s) -
Risbud Subhash H.,
Kirkpatrick R. James,
Taglialavore Antoni P.,
Montez B.
Publication year - 1987
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1987.tb04859.x
Subject(s) - magic angle , magic angle spinning , nmr spectra database , materials science , nuclear magnetic resonance spectroscopy , spectral line , aluminium , solid state nuclear magnetic resonance , analytical chemistry (journal) , spectroscopy , crystallography , high resolution , chemistry , nuclear magnetic resonance , stereochemistry , metallurgy , physics , remote sensing , chromatography , astronomy , quantum mechanics , geology
The structures of roller‐quenched SiO 2 ‐Al 2 O 3 glasses containing 10 to 50 wt% Al 2 O 3 were investigated by TEM and high‐resolution 27 Al and 29 Si magic angle sample spinning nuclear magnetic resonance (MASS‐NMR) spectroscopy. The chemical shifts observed in the NMR spectra of these phase‐separated (on the TEM scale) glasses provide evidence, for the existence of all three (4‐, 5‐, and 6‐jold) Al‐coordination units in these glasses and for the presence of A1 in both the Si‐rich and Si‐poor phases.