High-Resolution O-17 Nmr of Solid Silicates

TitleHigh-Resolution O-17 Nmr of Solid Silicates
Publication TypeJournal Article
Year of Publication1991
AuthorsMueller K.T, Wu Y., Chmelka B.F, Stebbins J., Pines A
JournalJournal of the American Chemical Society
Date PublishedJan 2
ISBN Number0002-7863
Accession NumberWOS:A1991ER08200006

Several O-17-enriched silicates were studied by use of dynamic angle spinning (DAS) and double rotation (DOR) nuclear magnetic resonance spectroscopy. These methods average away second-order quadrupolar interactions by reorienting a sample about a time-dependent axis, thereby yielding high-resolution spectra of oxygen-17 nuclei. A narrow spectral line is observed for each distinct oxygen site at the sum of the isotropic chemical shift and the field-dependent isotropic second-order quadrupolar shift. Resolution is increased by up to 2 orders of magnitude compared to conventional magic angle spinning (MAS) spectra. Crystallographically inequivalent oxygens are now observable as distinct resonances in spectra of polycrystalline silicates such as diopside (CaMgSi2(17)O6), wollastonite (CaSi17O3), clinoenstatite (MgSi17O3), larnite (Ca2Si17O4),and forsterite (Mg2Si17O4).

URL<Go to ISI>://WOS:A1991ER08200006
Short TitleHigh-Resolution O-17 Nmr of Solid Silicates
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