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- W1861958593 abstract "The solution of the diffusion equation for chemical diffusion processes in a mixed conductor located between an electronically blocking electrode and an ionically blocking electrode in an asymmetric electrochemical cell (coulometric titration cell) has been extended to materials with arbitrary electronic transport numbers. This solution allows the derivation of evaluation formulas for impedance spectroscopy as well as potentiostatic and galvanostatic polarization experiments in order to determine the chemical diffusion coefficient of mixed-conductivity compounds with comparable ionic and electronic conductivities. Impedance measurements as well as potentiostatic and galvanostatic polarization experiments are applied to determine the chemical diffusion coefficient of Ag 1.92 Te as a function of composition at 160°C using the cell Ag I AgI | Ag 1.92 Te | Pt. Ag 1.92 Te may be regarded as a typical example of a mixed ionic-electronic conductor with comparable ionic and electronic conductivities. The electronic transport numbers of Ag 1.92 Te needed for the evaluation of the chemical diffusion coefficient measurements are obtained from separate measurements of the partial conductivities by applying a dc four-point van der Pauw method. Typical values of the electronic transport number are in the range between 0.8 and 0.9 at 160°C. The chemical diffusion coefficient of Ag 1.92 Te increases slightly with increasing silver content of the sample, with typical values around 0.003 cm 2 s -1 . In the case of potentiostatic polarization experiments, a non-Cottrell behavior of the chemical diffusion process is observed. Agreement between the experimental results of the three methods is remarkably good." @default.
- W1861958593 created "2016-06-24" @default.
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- W1861958593 date "1998-06-01" @default.
- W1861958593 modified "2023-09-22" @default.
- W1861958593 title "Determination of Chemical Diffusion Coefficients of Mixed Ionic‐Electronic Conductors with Arbitrary Electronic Transport Numbers: Application of Impedance, Potentiostatic, and Galvanostatic Methods to" @default.
- W1861958593 doi "https://doi.org/10.1149/1.1838614" @default.
- W1861958593 hasPublicationYear "1998" @default.
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