Correlation between floppy to rigid transitions and non-Arrhenius conductivity in glasses

Abstract

Non-Arrhenius behaviour and fast increase of the ionic conductivity is observed for a number of potassium silicate glasses $(1-x)Si{O}_2-x{K}_{2}O$ with potassium oxide concentration larger than a certain value $x=x_c=0.14$. Recovering of Arrhenius behaviour is provided by the annealing that enhances densification. Conductivity furthermore obeys a percolation law with the same critical concentration $x_c$. These various results are the manifestation of the floppy or rigid nature of the network and can be analyzed with constraint theory. They underscore the key role played by network rigidity for the understanding of conduction and saturation effects in glassy electrolytes.

4 pages, 4 EPS figures

References in corpus (1)

• Rings and rigidity transitions in network glasses

Cited by in corpus (5)

• Fast-ion conduction and flexibility of glassy networks
• Onset of rigidty in glasses: from random to self-organized networks
• Non-Arrhenius ionic conductivities in glasses due to a distribution of activation energies
• Fast-ion conduction and flexibility and rigidity of solid electrolyte glasses
• One-dimensional steady transport by molecular dynamics simulation: Non-Boltzmann position distribution and non-Arrhenius dynamical behavior