Analysis and Application of Distribution of Relaxation Times in Solid State Ionics

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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 languageEnglish
Pages (from-to)12-18
Number of pages7
JournalSolid state ionics
Volume302
DOIs
Publication statusPublished - 22 Oct 2017

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Relaxation time
Distribution functions
relaxation time
distribution functions
solid state
Fourier transforms
impedance
programming
Cathodes
cathodes
computer programs
composite materials
Composite materials

Keywords

  • IR-103396
  • METIS-318413

Cite this

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title = "Analysis and Application of Distribution of Relaxation Times in Solid State Ionics",
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.",
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Analysis and Application of Distribution of Relaxation Times in Solid State Ionics. / Boukamp, Bernard A.; Rolle, A.

In: Solid state ionics, Vol. 302, 22.10.2017, p. 12-18.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Analysis and Application of Distribution of Relaxation Times in Solid State Ionics

AU - Boukamp, Bernard A.

AU - Rolle, A.

PY - 2017/10/22

Y1 - 2017/10/22

N2 - 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.

AB - 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.

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