Dynamic light scattering in network-forming sodium ultraphosphate liquids near the glass transition

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Abstract

The viscoelastic relaxation of glass-forming (Na2 O) x (P2 O5) 1-x liquids was measured by photon correlation spectroscopy at temperatures near the glass transition for compositions extending from pure phosphorus pentoxide to the metaphosphate (x=0.5). Over this compositional range, alkali addition produces a continuous depolymerization of the covalently bonded structure from one of a three-dimensional network to that of polymer chains. Substantial increases in the fragility accompany the depolymerization and are shown to be identical to those seen in certain ion-free chalcogenide glass formers suggesting the time scale for viscoelastic relaxation in network-forming liquids is controlled only by the topology of the covalent structure. The relaxation is nonexponential and the stretching exponent shows a complex variation with regards to both composition and temperature that is believed to arise from a decoupling of ionic motions from those of the network occurring as the glass transition is approached.

Original languageEnglish
Article number064201
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number6
DOIs
StatePublished - Aug 26 2009

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liquid sodium
Depolymerization
phosphorus pentoxide
Dynamic light scattering
Glass transition
light scattering
Sodium
Photon correlation spectroscopy
depolymerization
Glass
glass
Liquids
Alkalies
Chemical analysis
Stretching
Phosphorus
Polymers
Topology
Ions
Temperature

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

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title = "Dynamic light scattering in network-forming sodium ultraphosphate liquids near the glass transition",
abstract = "The viscoelastic relaxation of glass-forming (Na2 O) x (P2 O5) 1-x liquids was measured by photon correlation spectroscopy at temperatures near the glass transition for compositions extending from pure phosphorus pentoxide to the metaphosphate (x=0.5). Over this compositional range, alkali addition produces a continuous depolymerization of the covalently bonded structure from one of a three-dimensional network to that of polymer chains. Substantial increases in the fragility accompany the depolymerization and are shown to be identical to those seen in certain ion-free chalcogenide glass formers suggesting the time scale for viscoelastic relaxation in network-forming liquids is controlled only by the topology of the covalent structure. The relaxation is nonexponential and the stretching exponent shows a complex variation with regards to both composition and temperature that is believed to arise from a decoupling of ionic motions from those of the network occurring as the glass transition is approached.",
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N2 - The viscoelastic relaxation of glass-forming (Na2 O) x (P2 O5) 1-x liquids was measured by photon correlation spectroscopy at temperatures near the glass transition for compositions extending from pure phosphorus pentoxide to the metaphosphate (x=0.5). Over this compositional range, alkali addition produces a continuous depolymerization of the covalently bonded structure from one of a three-dimensional network to that of polymer chains. Substantial increases in the fragility accompany the depolymerization and are shown to be identical to those seen in certain ion-free chalcogenide glass formers suggesting the time scale for viscoelastic relaxation in network-forming liquids is controlled only by the topology of the covalent structure. The relaxation is nonexponential and the stretching exponent shows a complex variation with regards to both composition and temperature that is believed to arise from a decoupling of ionic motions from those of the network occurring as the glass transition is approached.

AB - The viscoelastic relaxation of glass-forming (Na2 O) x (P2 O5) 1-x liquids was measured by photon correlation spectroscopy at temperatures near the glass transition for compositions extending from pure phosphorus pentoxide to the metaphosphate (x=0.5). Over this compositional range, alkali addition produces a continuous depolymerization of the covalently bonded structure from one of a three-dimensional network to that of polymer chains. Substantial increases in the fragility accompany the depolymerization and are shown to be identical to those seen in certain ion-free chalcogenide glass formers suggesting the time scale for viscoelastic relaxation in network-forming liquids is controlled only by the topology of the covalent structure. The relaxation is nonexponential and the stretching exponent shows a complex variation with regards to both composition and temperature that is believed to arise from a decoupling of ionic motions from those of the network occurring as the glass transition is approached.

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