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 language | English (US) |
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Pages (from-to) | 3924-3927 |
Number of pages | 4 |
Journal | Journal of Non-Crystalline Solids |
Volume | 357 |
Issue number | 24 |
DOIs | |
State | Published - Dec 2011 |
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Materials Chemistry