Cross Effect Between Ion and Electron Flows in Fe3–δO4
- 1 May 2002
- journal article
- Published by Springer Science and Business Media LLC in Journal of Materials Research
- Vol. 17 (5), 1213-1219
- https://doi.org/10.1557/jmr.2002.0179
Abstract
The effective valence,of mobile cations (Fe2+, Fe3+) in semiconducting Fe3O4was determined at elevated temperatures via Tubandt-type electrotransport experiments in association with the literature data on the cation diffusivity and total electrical conductivity. It has been found that the value forvaries systematically from below 2 up to 3 with oxygen partial pressure at a fixed temperature. The effective valence is determined not only by the mobility difference of Fe2+and Fe3+ionsbut also by the cross effect between the cations and electrons upon their transfer. A value ofbetween 2 and 3 may be attributed to the mobility difference between Fe2+and Fe3+ions even in the absence of the cross effect, but the values of< 2 clearly indicate that the cross effect is in play in Fe3O4.Keywords
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