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27Al Solid-state nuclear magnetic resonance study of five-coordinate aluminum in augelite and senegalite

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Abstract

This is a report of 27Al magic-angle spinning, nuclear magnetic resonance spectroscopy of 5- and 6-coordinate aluminum in the aluminophosphate minerals augelite and senegalite. We have determined the quadrupolar coupling constants, asymmetry parameters and chemical shifts corrected for quadrupolar-induced shift for both aluminum coordination sites in each mineral. The quadrupolar coupling constants are significantly less in senegalite than in augelite. Structural analysis (viz., longitudinal- and shear-strain of the aluminum coordination polyhedra; coefficient-of-variation for both Al-O bond lengths and <O-Al-O bond angles) shows that both 5- and 6-coordinate aluminum sites in senegalite are less distorted than in augelite.

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Authors and Affiliations

  1. University of Wisconsin-Madison, 53706, Madison, WI, USA

    William F. Bleam

  2. Department of Chemistry, Colorado State University, 80523, Ft. Collins, CO, USA

    Stephen F. Dec & James S. Frye

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  1. William F. Bleam
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  2. Stephen F. Dec
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  3. James S. Frye
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Bleam, W.F., Dec, S.F. & Frye, J.S. 27Al Solid-state nuclear magnetic resonance study of five-coordinate aluminum in augelite and senegalite. Phys Chem Minerals 16, 817–820 (1989). https://doi.org/10.1007/BF00209706

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  • DOI: https://doi.org/10.1007/BF00209706

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