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Related Experiment Videos

Medium-range order in sodium phosphate glasses: a quantitative rotational echo double resonance solid state NMR

Wenzel Strojek1, Hellmut Eckert

  • 1Institut für Physikalische Chemie Westfälische Wilhelms-Universität Münster.

Physical Chemistry Chemical Physics : PCCP
|May 12, 2006
PubMed
Summary

Sodium ultraphosphate glasses exhibit complex glass transition temperatures. NMR studies reveal sodium ion distribution and coordination changes, impacting medium-range order and the overall glass properties.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Glass Science

Background:

  • Sodium ultraphosphate glasses, (Na(2)O)(x)(P(2)O(5))(1-x), display a non-linear relationship between glass transition temperature (Tg) and composition.
  • Understanding the underlying structural factors is crucial for tailoring glass properties.

Purpose of the Study:

  • To investigate the local and medium-range ordering in sodium ultraphosphate glasses.
  • To correlate structural changes with the observed non-linear glass transition temperature dependence on composition.

Main Methods:

  • High-resolution (23)Na and dipolar Nuclear Magnetic Resonance (NMR) spectroscopies.
  • Rotational Echo Double Resonance ((31)P(23)Na) and (23)Na((31)P) REDOR experiments.
  • Triple-Quantum Magic-Angle Spinning (TQMAS) NMR for (23)Na chemical shifts and quadrupolar coupling constants.

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Main Results:

  • Sodium ions are randomly distributed, correlating with Q((2)) units below x=0.25.
  • NMR data suggest a decreasing sodium coordination number with increasing x in this composition range.
  • Increased (31)P(23)Na dipolar interaction at x > 0.25 indicates enhanced Q((2))-Na-Q((2)) crosslinking.

Conclusions:

  • A detailed model of medium-range order in sodium ultraphosphate glasses has been established.
  • The non-linear Tg dependence is strongly linked to variations in phosphorus/sodium distance distributions and crosslinking.
  • NMR provides quantitative insights into the structural origins of glass properties.