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Some electrical properties of the defectiveγ phases of spinel structure during their transformation to the rhombohedral α phases

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Abstract

During the transformation of “cubic” iron sesquioxides, γ-Fe2O3, substituted by divalent or trivalent ions, to rhombohedral α phases, the electrical conductivity yields discontinuities and a change in plots of logσ againstf(1/T). The average temperature of these discontinuities is influenced by the particle size, and extent of oxidation and substitution. For divalent substituted defective spinels, the activation energy for the haematite precipitation appears to depend on the extent of substitution and the size of the particle.

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Authors and Affiliations

  1. Laboratoire de Recherches sur la Réactivité des Solides, Associé au C.N.R.S., B.P. 138, 21004, Dijon Cedex, France

    B. Gillot, R. M. Benloucif & F. Jemmali

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  1. B. Gillot
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  2. R. M. Benloucif
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  3. F. Jemmali
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Gillot, B., Benloucif, R.M. & Jemmali, F. Some electrical properties of the defectiveγ phases of spinel structure during their transformation to the rhombohedral α phases. J Mater Sci 19, 3806–3813 (1984). https://doi.org/10.1007/BF02396954

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  • DOI: https://doi.org/10.1007/BF02396954

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