Abstract
AbstractGalvanostatic polarization of a mixed conductor located between an ionically blocking electrode and an electronically blocking electrode in an asymmetric electrochemical cell is treated in detail. Evaluation formulae for the determination of the chemical diffusion coefficient of mixed conductors with comparable ionic and electronic transport numbers are introduced. They allow the determination of the chemical diffusion coefficient of Ag1.92Te as a function of composition at 160°C from galvanostatic polarization and depolarization experiments on the asymmetric cell Ag | AgI | Ag1.92Te | Pt. The chemical diffusion coefficient shows composition dependent values between 0.002 and 0.004 cm2s-1. The electronic transport numbers are obtained independently from four-point van der Pauw measurements with typical values around 0.8–0.9.
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