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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:34 |
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Conference: Bucharest University Faculty of Physics 2014 Meeting
Section: Solid State Physics and Materials Science
Title:
Influence of the processes at the interface ionic conductibility materials-electrodes on the dielectric spectroscopy measurement- a new theoretical approach
Authors:
C.P. GANEA
Affiliation:
National Institute of Materials Physics
E-mail
paul.ganea@infim.ro
Keywords:
ionic conductibility materials, dielectric spectroscopy, electrode polarization
Abstract:
The dielectric spectroscopy measurements can provide information on the electrokinetic properties of conductive materials such as, the diffusion coefficients and relaxation times for adsorption-desorption at electrodes surface.
The electrode polarization consists of accumulation of the ions at the metal electrodes surface of the measurement system. This effect highlights the nature of the charge transfer processes at the sample-electrode contact area. The main parameters that characterize the interfacial phenomena are the surface structure of the electrodes, the difference in ionic mobility of charge carriers, the adsorption-desorption phenomena. For this reason it is necessary to elaborate a theoretical model of electrode polarization allowing to study the realistic cases in which the electrodes are ohmic, on their surface can occur the adsorption-desorption of charge carriers; in the bulk the ions move by diffusion and drift, and between them there are the generation-recombination processes. With this new proposed mathematical model the analytic equivalent of the dielectric permittivity is obtained in a form that allows to determinate the physical quantities from the experimental data.
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