Breakdown of the fractional Stokes-Einstein relation in silicate liquids

John C. Mauro, Adam J. Ellison

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

The fractional Stokes-Einstein relation postulates a direct relationship between conductivity and shear flow. Like viscosity, the electrical resistivity of a glass-forming liquid exhibits a non-Arrhenius scaling with temperature. However, while both viscosity and resistivity are non-Arrhenius, here we show that these two properties follow distinct functional forms. Through analysis of 821 unique silicate liquids, we show that viscosity is best represented using the Mauro-Yue-Ellison-Gupta-Allan (MYEGA) model, whereas the resistivity of the same compositions more closely follows the Avramov-Milchev (AM) equation. Our results point to two fundamentally different mechanisms governing viscous flow and conductivity and therefore cast doubt on the general validity of the fractional Stokes-Einstein relation.

Original languageEnglish (US)
Pages (from-to)3924-3927
Number of pages4
JournalJournal of Non-Crystalline Solids
Volume357
Issue number24
DOIs
StatePublished - Dec 1 2011

All Science Journal Classification (ASJC) codes

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

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