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Mechanism and Cationic Rearrangements Involved in the Reduction of Co2+[Co 3+2-x Cr 3+x ]O 2−4 Spinels

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Reactivity of Solids

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Abstract

This work deals with the Co(II, III)-Cr(III) oxide series (or Co3O4-CoCr2O4 solid solutions) with compositions ranging from Co3O4 to CoCr2O4. These oxides crystallize in the spinel structure and, according to Makkonen, their lattice parameter increases linearly with their Cr content from 8.08 Å for Co3O4 to 8.33 Å for CoCr2O4 (1). They are paramagnetic above Tc(CoCr2O4) = 100°K and TN (Co3O4) = 40°K. From their Curie constants we show that the Co3+ ions have a zero magnetic moment and, thus, are in a low spin state in octahedral sites (B), the moment of tetrahedral (A) Co2+ being 4.6 ~ 4.7 µ B. Whence the formula:

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References

  1. P. Porta, F.S. Stone and R.G. Turner, J.Solid State Chem., 11, 135 (1974).

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Authors and Affiliations

  1. Laboratoire de Recherches sur la Réactivité des Solides, Dept B, Faculté des Sciences Mirande, 21000, Dijon, France

    P. Bracconi, L. Berthod & L. C. Dufour

Authors
  1. P. Bracconi
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  2. L. Berthod
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  3. L. C. Dufour
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Editor information

Editors and Affiliations

  1. Chalmers University of Technology, Goteborg, Sweden

    John Wood , Oliver Lindqvist  & Nils-Gösta Vannerberg ,  & 

  2. Arbman Development AB, Stockholm, Sweden

    Claes Helgesson

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© 1977 Springer Science+Business Media New York

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Bracconi, P., Berthod, L., Dufour, L.C. (1977). Mechanism and Cationic Rearrangements Involved in the Reduction of Co2+[Co 3+2-x Cr 3+x ]O 2−4 Spinels. In: Wood, J., Lindqvist, O., Helgesson, C., Vannerberg, NG. (eds) Reactivity of Solids. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-2340-2_45

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  • DOI: https://doi.org/10.1007/978-1-4684-2340-2_45

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-1-4684-2342-6

  • Online ISBN: 978-1-4684-2340-2

  • eBook Packages: Springer Book Archive

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