2011/06/07 by S. Emmert, M. Wolf, Martin Wolf +5
Chemical Engineering · Chemistry · Engineering · Materials Science · Physics and Astronomy · #Analytical Chemistry (journal) #Chemistry #Composite material #Condensed matter physics #Dielectric #Dielectric properties of ceramics #Dielectric spectroscopy #Electrical conductor #Electrical engineering #Electrochemistry #Electrode #Engineering #Equivalent circuit #Ferroelectric and Piezoelectric Materials #Ion #Ionic bonding #Ionic liquids properties and applications #Materials science #Optoelectronics #Phenomenological model #Physical chemistry #Physics #Polarization (electrochemistry) #Voltage #cond-mat.soft #physics.chem-ph
paper · pdf · doi:10.1140/epjb/e2011-20439-8
published as Eur. Phys. J. B 83 (2011) 157 · 9 pages, 6 figures, experimental data are provided in electronic form (see "Data Conservancy")
arxiv created 2011/06/07 · openalex publication_date 2011/09/01 · arxiv updated 2015/03/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
In the present work, we provide broadband dielectric spectra showing strong electrode polarization effects for various materials, belonging to very different material classes. This includes both ionic and electronic conductors as, e.g., salt solutions, ionic liquids, human blood, and colossal-dielectric-constant materials. These data are intended to provide a broad data base enabling a critical test of the validity of phenomenological and microscopic models for electrode polarization. In the present work, the results are analyzed using a simple phenomenological equivalent-circuit description, involving a distributed parallel RC circuit element for the modeling of the weakly conducting regions close to the electrodes. Excellent fits of the experimental data are achieved in this way, demonstrating the universal applicability of this approach. In the investigated ionically conducting materials, we find the universal appearance of a second dispersion region due to electrode polarization, which is only revealed if measuring down to sufficiently low frequencies. This indicates the presence of a second charge-transport process in ionic conductors with blocking electrodes.