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An Explanation of Anomalous Diffusion Patterns Observed in Electroactive Materials by Impedance Methods
Author(s) -
Bisquert Juan,
GarciaBelmonte Germà,
Pitarch Ángeles
Publication year - 2003
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200390046
Subject(s) - electrical impedance , diffusion , trapping , relaxation (psychology) , dielectric spectroscopy , chemical physics , anomalous diffusion , chemistry , electron , jump , ion , spectral line , condensed matter physics , materials science , molecular physics , electrochemistry , thermodynamics , electrode , physics , psychology , ecology , social psychology , knowledge management , innovation diffusion , organic chemistry , quantum mechanics , computer science , biology , astronomy
Hop, skip, and jump? Diffusion impedance in disordered systems was used to consider some physical aspects of carrier diffusion in electroactive films. Energy dispersion of ion sites or a distribution of electron sites (traps) is a common feature of these systems. The implications for transport are analyzed with a view to interpreting electrochemical impedance spectra. An explanation is given for anomalous diffusion patterns observed in electroactive materials, and structured impedance spectra (see figure) are described in terms of carrier hopping, trapping, and relaxation in the solid state.