K L Ngai et al 2003 J. Phys.: Condens. Matter 15 S1607 doi:10.1088/0953-8984/15/16/310
A combined molecular dynamics simulation, experimental and coupling model study of the ion dynamics in glassy ionic conductors
K L Ngai1,5, J Habasaki2, Y Hiwatari3 and C León4
Show affiliationsDielectric relaxation measurements of the ion dynamics in glassy, molten and crystalline ionic conductors show general properties independent of chemical composition and structure. These include the appearance of a near-constant loss at high frequencies/low temperatures and the transition to a many-particle ion-hopping regime at lower frequencies. We use a combination of molecular dynamics simulation, experimental data analysis and the coupling model to characterize the ion dynamics in the near-constant-loss regime, the transition zone, and the many-particle ion-hopping regime. An improved understanding is gained of the origin of the near-constant loss and the evolution of the ion dynamics, from short times when the ions are caged, to long times when they are no longer caged but participate in the many-particle dynamics, giving rise finally to dc conductivity. Reasons are given to refute criticism of use of the electric modulus to represent and interpret experimental data.
- PACS
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77.22.Gm Dielectric loss and relaxation
72.20.Ee Mobility edges; hopping transport
61.43.Bn Structural modeling: serial-addition models, computer simulation
- Subjects
- Dates
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Issue 16 (30 April 2003)
Received 12 March 2003
Published 14 April 2003
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A combined molecular dynamics simulation, experimental and coupling model study of the ion dynamics in glassy ionic conductors
K L Ngai et al 2003 J. Phys.: Condens. Matter 15 S1607
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