Physics and Chemistry of Minerals

, Volume 23, Issue 8, pp 526–534 | Cite as

Dynamics of Na in sodium aluminosilicate glasses and liquids

  • A. M. George
  • J. F. Stebbins
Original Paper


23Na NMR measurements on Na2Si3O7, Na3AlSi6O15, and NaAlSi3O8 glasses from room temperature to 1200°C show that the dynamics and local structure of sodium in silicate/aluminosilicate glasses and melts vary with composition and temperature.

The peak positions decrease in frequency between room temperature and 200°C indicating that the Na sees a larger average site as temperature is increased. Between 200°–300° and 700°C, line widths, nutation frequencies and peak positions are consistent with motional averaging of quadrupolar satellites. Above 700°C there is little or no change in the peak positions with temperature. Chemical shifts of the materials at 1000°C (Na2Si3O7: 3.6; Na3AlSi6O15:-1.3; NaAlSi3O8:-6.4 ppm) indicate a slight change in the average Na coordination number from 6–7 for the silicate to 7–8 for the aluminosilicates.

Relaxation time (T1) measurements show a shift in the T1 minimum to higher temperature with the addition of aluminum to the system. This is indicative of Na motion being hindered in aluminosilicates relative to silicates. Comparison of the data to a model for spin-lattice relaxation involving a distribution of barrier heights to atomic hopping (Svare et al. 1993) yields average barrier heights consistent with this, as well as indicating differences in the number of neighboring sites and amount of disorder around Na sites in the three glasses. The slopes on the high temperature side of the relaxation curves yield apparent activation energies for diffusion of 70 kJ/mol, as has been previously seen for several other alkali silicate liquids.


Barrier Height Aluminosilicate Apparent Activation Energy Relaxation Curve Temperature Side 
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Copyright information

© Springer-Verlag 1996

Authors and Affiliations

  • A. M. George
    • 1
  • J. F. Stebbins
    • 1
  1. 1.Deparment of Geological and Environmental SciencesStanford UniversityStanfordUSA

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