23Na NMR chemical shifts and local Na coordination environments in silicate crystals, melts and glasses

Xianyu Xue, Jonathan F. Stebbins

Research output: Contribution to journalArticle

165 Citations (Scopus)

Abstract

In order to decipher information about the local coordination environments of Na in anhydrous silicates from 23Na nuclear magnetic resonance spectroscopy (NMR), we have collected 23Na magic angle spinning (MAS) NMR spectra on several sodium-bearing silicate and aluminosilicate crystals with known structures. These data, together with those from the literature, suggest that the 23Na isotropic chemical shift correlates well with both the Na coordination and the degree of polymerization (characterized by NBO/T) of the material. The presence of a dissimilar network modifier also affects the 23Na isotropic chemical shift. From these relations, we found that the average Na coordinations in sodium silicate and aluminosilicate liquids of a range of compositions at 1 bar are nearly constant at around 6-7. The average Na coordinations in glasses of similar compositions also vary little with Na content (degree of polymerization). However, limited data on ternary alkali silicate and aluminosilicate glasses seem to suggest that the introduction of another network-modifier, such as K or Cs, does cause variations in the average local Na coordination. Thus it appears that the average Na coordination environments in silicate glasses are more sensitive to the presence of other network-modifiers than to the variations in the topology of the silicate tetrahedral network. Further studies on silicate glasses containing mixed cations are necessary to confirm this conclusion.

Original languageEnglish
Pages (from-to)297-307
Number of pages11
JournalPhysics and Chemistry of Minerals
Volume20
Issue number5
DOIs
Publication statusPublished - Oct 1993
Externally publishedYes

Fingerprint

Silicates
Chemical shift
Nuclear magnetic resonance spectroscopy
nuclear magnetic resonance
silicate
glass
spectroscopy
melt
crystal
Glass
Crystals
Aluminosilicates
aluminosilicate
polymerization
Bearings (structural)
Polymerization
Sodium
sodium
Magic angle spinning
Alkalies

ASJC Scopus subject areas

  • Materials Science(all)
  • Geochemistry and Petrology
  • Earth and Planetary Sciences(all)
  • Environmental Science(all)

Cite this

23Na NMR chemical shifts and local Na coordination environments in silicate crystals, melts and glasses. / Xue, Xianyu; Stebbins, Jonathan F.

In: Physics and Chemistry of Minerals, Vol. 20, No. 5, 10.1993, p. 297-307.

Research output: Contribution to journalArticle

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