Journal
SOLID STATE IONICS
Volume 180, Issue 14-16, Pages 922-927Publisher
ELSEVIER
DOI: 10.1016/j.ssi.2009.04.002
Keywords
Impedance spectroscopy; CPE; CMR; Equivalent circuit
Categories
Funding
- Deutsche Forschungsgemeinschaft [458]
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Complex impedance spectra of ion-conducting lithium borate network glasses are used to study the deformed shape of impedance semicircles which are usually described by a parallel circuit of an ohmic resistor and a phenomenological Constant Phase Element (CPE). Based on the Concept of Mismatch and Relaxation (CMR) of Funke et al. which provides a theoretical treatment of the ion dynamics in disordered materials, a quantitative description of the experimental impedance spectra is presented. It takes into account the contribution of the static glass network by introducing an additional capacitor, and provides both, a physical interpretation of the CPE and an easy-to-handle mathematical formula to calculate the 'real' capacity of a CPE. (C) 2009 Elsevier B.V. All rights reserved.
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