Mathews, Tom and Jacob, KT (1992) Seebeck Coefficient of Magnetite: A Reinterpretation Invoking Jahn-Teller Entropy. In: Solid State Communications, 84 (10). pp. 975-978.
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Abstract
The Seebeck coefficient of stoichiometric $Fe_3O_4$ has been measured at high temperature in a controlled $CO + CO_2$ gas atmosphere. Assuming small polaron transport via octahedral sites, the cation distribution between the tetrahedral and octahedral sites of the spinel is obtained as a function of temperature from the Seebeck coefficient. The temperature dependence of cation distribution is explained by a new model in which the entropy arising from randomization of the Jahn-Teller distortion is incorporated. It is unnecessary to postulate that the enthalpy change for the cation interchange reaction is a linear function of the cation disorder parameter.
Item Type: | Journal Article |
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Publication: | Solid State Communications |
Publisher: | Elsevier Science Ltd |
Additional Information: | Copyright of this article belongs to Elsevier Science Ltd. |
Keywords: | coefficient of magnetite;Jahn-Teller entropy;stoichiometric Fe3O4 |
Department/Centre: | Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy) |
Date Deposited: | 03 Jan 2008 |
Last Modified: | 19 Sep 2010 04:42 |
URI: | http://eprints.iisc.ac.in/id/eprint/12840 |
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