Anomalous-diffusion model of ionic transport in oxide glasses
- Department 1845, Sandia National Laboratories, Albuquerque, New Mexico 87185-0607 (United States)
The power-law frequency dependence of both the conductivity, [sigma]([omega]), and permittivity, [var epsilon]([omega]), of ion-conducting materials suggests that self-similar or scale-invariant behavior influences the transport of ions at high frequencies. Using an anomalous-diffusion model, we derive relevant power-law expressions for [sigma]([omega]) and [var epsilon]([omega]) and compare these with measurements performed on LiPO[sub 3] glass. Superior fits to the measured data are obtained compared to the commonly used Kohlrausch-Williams-Watts (KWW) description of the electrical modulus, most particularly in the notorious high-frequency regime. Evaluation of our results in terms of an anomalous-diffusion model suggests the dominance of interaction-based constraints to diffusion.
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 6604546
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 51:5; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360606* -- Other Materials-- Physical Properties-- (1992-)
ALKALI METAL COMPOUNDS
ALLOY SYSTEMS
CHALCOGENIDES
DIFFUSION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FREQUENCY DEPENDENCE
GLASS
IONIC CONDUCTIVITY
LITHIUM COMPOUNDS
LITHIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PERMITTIVITY
PHOSPHORUS COMPOUNDS
PHOSPHORUS OXIDES
PHYSICAL PROPERTIES
TERNARY ALLOY SYSTEMS