Transport processes in mixed conducting oxides: combining time domain experiments and frequency domain analysis

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Abstract

The conductivity relaxation (CR) method is often used for measuring the surface transfer rate, Ktr, and the bulk diffusion coefficient, $$\tilde{D},$$ for oxygen transport in mixed conducting oxides (MIECs). The time domain analysis of the obtained CR response is rather complex and is based on lsquoidealrsquo behaviour for the diffusion process. It is quite favourable to perform the data analysis in the frequency domain, where lsquonon-idealrsquo responses are easily recognised. Besides, frequency domain analysis (impedance spectroscopy) can yield reliable parameter estimates. Using a discrete Fourier-transform procedure, the time domain responses can be transformed to a frequency domain impedance-type expression. This approach can be applied to any system for which a driving force and a resulting flux can be defined.
Original languageUndefined
Pages (from-to)592-598
Number of pages7
JournalJournal of solid state electrochemistry
Volume8
Issue number9
DOIs
Publication statusPublished - 2004

Keywords

  • METIS-222020
  • IR-71980

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