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Occupancy of T sites in the scapolite series; a multinuclear NMR study using magic-angle spinning

Barbara L. Sherriff, H. Douglas Grundy and J. Stephen Hartman
Occupancy of T sites in the scapolite series; a multinuclear NMR study using magic-angle spinning
The Canadian Mineralogist (December 1987) 25, Part 4: 717-730

Abstract

Magic-angle spinning (MAS) NMR spectra were obtained for (super 29) Si, (super 27) Al, (super 23) Na and (super 13) C in a series of 15 natural scapolite samples ranging from 21.3% meonite to 91.3% meonite. The (super 29) Si peaks are assigned to specific tetrahedral configurations from calculations of peak positions based on a modification of the semi-empirical formula of Janes & Oldfield [J. Amer. Chem. Soc., 107, 1985, 6769]. A model for Al-Si ordering of the framework has been developed from the original X-ray refinements of the structures, which determines the composition of the anion-cation clusters in the framework cavities. This model is consistent with the peak positions and relative intensities of the (super 29) Si MAS NMR spectra and explains (super 23) Na and (super 27) Al NMR spectra.


ISSN: 0008-4476
EISSN: 1499-1276
Coden: CAMIA6
Serial Title: The Canadian Mineralogist
Serial Volume: 25, Part 4
Title: Occupancy of T sites in the scapolite series; a multinuclear NMR study using magic-angle spinning
Affiliation: McMaster Univ., Dep. Geol., Hamilton, ON, Canada
Pages: 717-730
Published: 198712
Text Language: English
Summary Language: French
Publisher: Mineralogical Association of Canada, Ottawa, ON, Canada
References: 27
Accession Number: 1988-020307
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 8 tables
Secondary Affiliation: Brock Univ., CAN, Canada
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 1988
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