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Magic angle spinning NMR observation of sodium site exchange in nepheline at 500° C

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Abstract

Dynamics in minerals at time scales from seconds to microseconds are important in understanding mechanisms of displacive phase transitions, diffusion, and conductivity. High resolution, magic-angle-spinning (MAS) NMR spectroscopy can directly show the rates of exchange among sites, potentially providing less model-dependent information than more traditional NMR relaxation time measurements. Here we use a newly developed high temperature MAS probe (Doty Scientific, Inc.) to observe the exchange of Na+ among the alkali sites in a high-Na nepheline at temperatures as high as 500° C. Observed exchange rates are consistent with correlation times derived from cation diffusivity.

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Authors and Affiliations

  1. Department of Geology, Stanford University, 94305, Stanford, CA, USA

    Jonathan F. Stebbins & Ian Farnan

  2. Varian Associates, Inc., 611 Hansen Way, 94303, Palo Alto, CA, USA

    Evan H. Williams

  3. CNRS-CRSCM, F-45071, Orléans, France

    Jacques Roux

Authors
  1. Jonathan F. Stebbins
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  2. Ian Farnan
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  3. Evan H. Williams
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  4. Jacques Roux
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Stebbins, J.F., Farnan, I., Williams, E.H. et al. Magic angle spinning NMR observation of sodium site exchange in nepheline at 500° C. Phys Chem Minerals 16, 763–766 (1989). https://doi.org/10.1007/BF00209699

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  • DOI: https://doi.org/10.1007/BF00209699

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