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AC Properties of a Random Barrier Network
Author(s) -
Sinkkonen J.
Publication year - 1981
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221030125
Subject(s) - percolation threshold , condensed matter physics , materials science , conductivity , percolation (cognitive psychology) , percolation theory , dielectric , frequency dependence , statistical physics , constant (computer programming) , physics , thermodynamics , electrical resistivity and conductivity , nuclear magnetic resonance , quantum mechanics , computer science , optoelectronics , neuroscience , biology , programming language
The ac properties of random barrier network are analyzed using the effective medium theory. At low frequencies σ m ∼ ω s and at high frequencies it saturates to the value determined by the conductivity of the bulk material. Below the percolation threshold s ≈ 0.8, at the threshold s ≈ 0.4, and above the threshold s still decreases. The effective dielectric constant ε m decreases with increasing frequency saturating to the bulk value at high frequencies. At the percolation threshold ε m shows a pronounced maximum exceeding by several orders of magnitude the bulk value.