Solid-state NMR and IR spectroscopic investigation of the role of structural water and F in carbonate-rich fluorapatite

Harris E. Mason; Francis M. McCubbin; Alexander Smirnov; Brian L. Phillips

doi:10.2138/am.2009.3095

Published by De Gruyter April 1, 2015

Solid-state NMR and IR spectroscopic investigation of the role of structural water and F in carbonate-rich fluorapatite

Harris E. Mason , Francis M. McCubbin , Alexander Smirnov and Brian L. Phillips

From the journal American Mineralogist

https://doi.org/10.2138/am.2009.3095

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Abstract

We have studied the substitutions in a natural well-crystallized carbonate-containing apatite-(CaF) (var. staffelite) using infrared (IR) and solid-state nuclear magnetic resonance (NMR) spectroscopic techniques. Our results show the presence of both A- and B-type carbonate plus a large amount of structural water (0.44 pfu). This sample also contains 0.21 pfu excess F, but only weak C-F dipolar coupling is observed indicating that a tetrahedral CO₃F^3- complex does not occur. ¹⁹F NMR results indicate the presence of a second F environment in the apatite structure at a concentration similar to that of B-type carbonate but which does not differ from channel F in terms of coupling to ³¹P or ¹H.

Keywords : Apatite-(CaF); IR spectroscopy; NMR spectroscopy

Received: 2008-9-22

Accepted: 2008-12-8

Published Online: 2015-4-1

Published in Print: 2009-4-1

Solid-state NMR and IR spectroscopic investigation of the role of structural water and F in carbonate-rich fluorapatite

Abstract

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