Viscoelastic relaxation in molten phosphorus pentoxide using photon correlation spectroscopy

David L. Sidebottom, J. R. Changstrom

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Abstract

A study of the viscoelastic relaxation in anhydrous liquid P2 O5 is reported. Properties of the time decay of the dynamic structure factor, including the average structural relaxation time and the stretching exponent, were obtained for temperatures from 850°C to near the glass transition (Tg =419°C) using photon correlation spectroscopy. Analysis indicates that P2 O5 is a strong glass-forming liquid but one that exhibits an abnormally nonexponential relaxation near Tg. The viscoelastic behavior of P2 O5 is compared with that of its alkali-metal-modified metaphosphate counterparts NaP O3 and LiP O3, as well as with the mechanical relaxation of chalcogenide glasses, to demonstrate common patterns in dynamical behavior presumably arising from changes in the average connectivity of the glass structure.

Original languageEnglish
Article number020201
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume77
Issue number2
DOIs
StatePublished - Jan 16 2008

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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