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Observation and accurate quantification of 27Al MAS NMR spectra of some Al2SiO5 polymorphs containing sites with large quadrupole interactions

✍ Scribed by L.B. Alemany; D. Massiot; B.L. Sherriff; M.E. Smith; F. Taulelle

Publisher: Elsevier Science
Year: 1991
Tongue: English
Weight: 513 KB
Volume: 177
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(91)85035-u

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✦ Synopsis

Al MAS NMR spectra from two poiymorphs of AlaSi05, kyanite and andalusite, are presented. Unambiguous extraction of quadrupole interactions of up to 15.5 MHz (= C,=e2gQ/h) are possible from fast MAS( > 18 kHz) NMR spectra obtained at an applied magnetic field of 11.7 T. It is shown from a knowledge of the magnitude of C, combined with some recently introduced analysis that correction of the integrated intensity of the centreband to reflect accurately the aluminium distribution in these samples is possible.