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A high-temperature high-resolution NMR study of 23Na, 27Al and 29Si in molten silicates

Nature volume 314, pages 250–252 (1985)Cite this article

Abstract

Molecular and atomic motions over longer distances, and with much lower frequencies than interatomic vibrations, have a major role in the energetic and dynamic properties of highly structured liquids such as molten aluminosilicates. Rearrangement with increasing temperature of the polymerized anionic network (composed of linked SiO44− and AlO45− tetrahedra) controls viscosity and influences thermal expansion and configurational heat capacity1,2. Diffusive motion of network modifying cations (such as Na+) through the structure allows electrical conductivity and probably also affects entropy. To study such motion directly and to compare liquid and glass structure, we have developed a novel high-temperature high-resolution NMR apparatus. We report here the first data on 23Na, 27Al, and 29Si in liquids in the system Na2O/Al2O3/SiO2 at temperatures to about 1,300 °C. Observed changes in NMR resonant frequencies (chemical shifts) give information on the effects of composition on local structure. Line shapes and widths, and relaxation time measurements, reveal details of the dynamics and of the transition from liquid to glass.

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Author information

Author notes

  1. J. F. Stebbins

    Present address: Department of Geology, Stanford University, Stanford, California, 94305, USA

  2. J. B. Murdoch

    Present address: Technicare Corporation, PO Box 5130, Cleveland, Ohio, 44101, USA

Authors and Affiliations

  1. Earth Sciences Division, Lawrence Berkeley Laboratory, Berkeley, California, 94720, USA

    J. F. Stebbins, J. B. Murdoch & I. S. E. Carmichael

  2. Department of Chemistry, University of California, Berkeley, California, 94720, USA

    E. Schneider & A. Pines

  3. Materials and Molecular Research Division, Lawrence Berkeley Laboratory, Berkeley, California, 94720, USA

    E. Schneider & A. Pines

Authors
  1. J. F. Stebbins
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  2. J. B. Murdoch
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  3. E. Schneider
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  4. I. S. E. Carmichael
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  5. A. Pines
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Stebbins, J., Murdoch, J., Schneider, E. et al. A high-temperature high-resolution NMR study of 23Na, 27Al and 29Si in molten silicates. Nature 314, 250–252 (1985). https://doi.org/10.1038/314250a0

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