Abstract
Three methods for obtaining a Distribution (Function) of Relaxation Times (DFRT) are compared, Fourier transform (FT), Tikhonov regularization (TR) and a multiple-(RQ) CNLS-fit. The FT method was written in the programming package ‘Borland Delphi’, for the Tikhonov regularization (TR) a freely available MatLab application (DRTtools) was used. The CNLS-fit was performed with the EqCwin95 software. Where possible the DFRT's were compared with an exact, calculated τ-domain representation of the model impedance. Practical use of the DFRT is demonstrated in the analysis of the impedance of a Ca3Co4O9 + δ-Ce0.9Gd0.1O0.95 composite cathode (CCO-CGO). The comparison shows that the FT and TR methods have problems in presenting the sharp and asymmetric peak of the DFRT of a Gerischer dispersion. In that case the multiple-(RQ) CNLS-fit presents too many peaks. Reconstruction of the impedance from the DFRT and comparing it to the original data set is a useful validation procedure for the DFRT.
Original language | English |
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Pages (from-to) | 12-18 |
Number of pages | 7 |
Journal | Solid state ionics |
Volume | 302 |
DOIs | |
Publication status | Published - 22 Oct 2017 |
Keywords
- IR-103396
- METIS-318413
- 22/4 OA procedure