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Cross Effect Between Ion and Electron Flows in Fe3–δO4

Published online by Cambridge University Press:  31 January 2011

Jeong-Oh Hong  and
Han-Ill Yoo
Jeong-Oh Hong*
Affiliation:
Solid State Ionics Research Laboratory, School of Materials Science and Engineering, Seoul National University, Seoul 151–742, Korea
Han-Ill Yoo
Affiliation:
Solid State Ionics Research Laboratory, School of Materials Science and Engineering, Seoul National University, Seoul 151–742, Korea
*
a)Address all correspondence to this author. Present address: Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan. e-mail: johong@tagen.tohoku.ac.jp
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Extract

The effective valence, of mobile cations (Fe2+, Fe3+) in semiconducting Fe3O4 was 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 for varies 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+ ions but also by the cross effect between the cations and electrons upon their transfer . A value of between 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.

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Journal of Materials Research , Volume 17 , Issue 5 , May 2002 , pp. 1213 - 1219
Copyright
Copyright © Materials Research Society 2002

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