Al-O-Al oxygen sites in crystalline aluminates and aluminosilicate glasses; high-resolution oxygen-17 NMR results

We report 17O magic-angle spinning (MAS) NMR data for crystalline NaAlO2 and CaAl2O4 at external magnetic fields of 9.4 and 14.1 T, as model compounds for Al-O-Al sites in tetrahedral networks. The former contains one peak with isotropic chemical shift (δiso) = 30.9 ppm and quadrupolar coupling cons...

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Bibliographic Details
Published in:The American mineralogist 1999-06, Vol.84 (5-6), p.983-986
Main Authors: Stebbins, Jonathan F, Lee, Sung Keun, Oglesby, Jane V
Format: Article
Language:English
Subjects:
aluminates
aluminosilicates
aluminum oxides
cations
crystallization
Crystals
experimental studies
Geochemistry
glasses
igneous rocks
isotopes
Magnetic fields
Mineralogy
NMR spectra
O-17
oxides
Oxygen
Scientific imaging
silicates
spectra
stable isotopes
synthetic materials
triple-quantum MAS spectra
volcanic rocks
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Summary:We report 17O magic-angle spinning (MAS) NMR data for crystalline NaAlO2 and CaAl2O4 at external magnetic fields of 9.4 and 14.1 T, as model compounds for Al-O-Al sites in tetrahedral networks. The former contains one peak with isotropic chemical shift (δiso) = 30.9 ppm and quadrupolar coupling constant (CQ)≈1.8 MHz. The latter contains several peaks with δiso ranging from 39 to 87 ppm and CQ≈1.5 to 2.4 MHz. Triple-quantum MAS (3QMAS) spectra of sodium and calcium aluminosilicate glasses with Si/Al
ISSN:0003-004X
1945-3027
DOI:10.2138/am-1999-5-635