Electrochemical Transient Investigations of the Diffusion and Concentration of Electrons in Yttria Stabilized Zirconia-Solid Electrolytes
Open Access
- 1 November 1976
- journal article
- Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung A
- Vol. 31 (11) , 1336-1343
- https://doi.org/10.1515/zna-1976-1112
Abstract
The voltage relaxation of galvanic cells with zirconia electrolytes polarized between an inert silver electrode and an Fe + FeO electrode has been analyzed to obtain the diffusion coefficient of the electronic minority charge carriers in the temperature range between 700 and 900 °C. The method has been examined by using different thicknesses of the sample. At 800 °C the diffusion coefficient of the electrons is 1.4 × 10-3 cm2 /sec, i.e., about two orders of magnitude higher than that for the holes, 4.5 × 10-6 cm2/sec. The activation energy 0.55 eV is obtained for the electrons, compared to 1.4 eV for the holes. From conductivity data, the concentrations of electrons and holes at 800 °C and 1 atm oxygen partial pressure are calculated to be 1 × 109 and 4 × 1017 cm-3, respectively. The electronic band gap is evaluated to be 4.1 eV.Keywords
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