Solid-state NMR investigations of sodium-cesium mixed-alkali phosphate glasses

S. Prabakar, K. T. Mueller

Research output: Contribution to journalConference articlepeer-review

18 Scopus citations


Simultaneous structural correlations between 31P and 23Na nuclei and between 31P and 133Cs nuclei in a series of mixed-alkali sodium-cesium phosphate glasses are investigated by transfer of populations via double resonance (TRAPDOR) NMR spectroscopy. The variations in spatial proximity between 31P nuclei at the center of phosphate tetrahedra and sodium (or cesium) modifier ions in the system xCs 2O: (56 - x) Na2O: 44 P2O5 (where x = 0 - 40) are followed systematically as a function of alkali oxide composition. The TRAPDOR method probes specific interactions between 31P and 23Na (or 133Cs) nuclei through the direct nuclear spin dipolar interaction. 31P MAS NMR spectra of these polyphosphate glasses reveal two phosphate environments corresponding to phosphorus atoms with two (Q2) and one (Q1) non-bridging oxygens in a 2.7:1 ratio, as expected from a simple depolymerization model. The Q 2/Q1 ratios measured using the TRAPDOR technique show a mixed-alkali effect as a function of alkali oxide concentration, revealing a maximum in the effect for 31P-23Na pairings and a minimum interaction for 31P-133Cs at concentrations of approximately 35mol% for each of the respective alkali cations.

Original languageEnglish (US)
Pages (from-to)80-87
Number of pages8
JournalJournal of Non-Crystalline Solids
Issue number1-3
StatePublished - Dec 1 2004
EventGlass Science for High Technology. 16th University Conference - Troy, NY, United States
Duration: Aug 13 2004Aug 15 2004

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry


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