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Seebeck Coefficient of Magnetite: A Reinterpretation Invoking Jahn-Teller Entropy

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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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
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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