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Author Sidebottom, D. L.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ IONIC CONDUCTIVITY ♦ FREQUENCY DEPENDENCE ♦ DIMENSIONS ♦ POLARIZATION ♦ CRYSTALS ♦ POLYCRYSTALS ♦ AMORPHOUS STATE ♦ OXIDES ♦ DISPERSION RELATIONS
Abstract The dielectric response of many materials exhibits universal behavior in the form of a power law frequency dependence of the ac conductivity. This response is seen in all types of structures both crystalline and amorphous and for all types of polarizing species including dipoles and ions. Here I demonstrate that for ionic materials the power law exponent decreases with decreasing dimensionality of the ion conduction pathways. Although percolation concepts such as random walks on a self-similar fractal lattice provide a qualitative explanation, experimental findings instead indicate that the dispersion is the result of localized ion motion occurring on an atomic length scale. {copyright} {ital 1999} {ital The American Physical Society }
ISSN 00319007
Educational Use Research
Learning Resource Type Article
Publisher Date 1999-08-01
Publisher Place United States
Journal Physical Review Letters
Volume Number 83
Issue Number 5


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