Issue 6, 2005

Non-Arrhenius viscosity related to short-time ion dynamics in a fragile molten salt

Abstract

The equation T·σDC(T) = α·exp[−(E*/kBT) − γ·exp(E*/kBT)] has been used to understand the non-Arrhenius behaviour of the DC conductivity in supercooled glass-forming melts. Here, α, γ and E* are parameters, E* denoting the activation energy for an elementary displacive step. Unlike the empirical VTF relation, our equation provides a link between the long-time and the short-time ion dynamics as observed in broad-band conductivity spectra. Surprisingly, the same equation with the same value of E* but different γ successfully describes the fluidity (inverse viscosity) of a fragile glass-forming melt. This opens up the possibility of relating non-Arrhenius viscosities to short-time properties, which is in agreement with recent experimental and computer-simulation results.

Graphical abstract: Non-Arrhenius viscosity related to short-time ion dynamics in a fragile molten salt

Article information

Article type
Communication
Submitted
07 Dec 2004
Accepted
10 Feb 2005
First published
17 Feb 2005

Phys. Chem. Chem. Phys., 2005,7, 1096-1099

Non-Arrhenius viscosity related to short-time ion dynamics in a fragile molten salt

P. Singh, R. D. Banhatti and K. Funke, Phys. Chem. Chem. Phys., 2005, 7, 1096 DOI: 10.1039/B418432G

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