Observation of six-coordinate aluminum in andalusite by solid-state 27Al MAS NMR
β Scribed by Steven F Dec; John J Fitzgerald; James S Frye; Michael P Shatlock; Gary E Maciel
- Publisher
- Elsevier Science
- Year
- 1991
- Weight
- 230 KB
- Volume
- 93
- Category
- Article
- ISSN
- 0022-2364
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π SIMILAR VOLUMES
## Abstract Some silicaβbased solids, prepared by the sol/gel method in the presence of high Mn^2+^ concentrations, have been characterized by the ^29^Si, ^27^Al MAS NMR spectra and ^29^Si T~1~ measurements. The singleβpulse ^29^Si and ^27^Al MAS NMR spectra have shown broad spinning sideband patte
## Hgh -resolutton 27Al NhlR spectra of polycrystalhne alumrnntes have been studled at 70 4 hfHz hlaglc-angle spummg was used to reduce quadrupole effects and dlpolar mtenctlon. The isotropic \*'Al chenuul shrfts depend mamly on the AI-O coordmatlon For Al-O tetrahedra stufts of 55 to 80 ppm were