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Surface and bulk cation distribution of the spinel system ZnxMg1−xFe2O4

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Abstract

ZnxMg1-xFe2O4 mixed oxide spinels (x=0.0, 0.2, 0.4, 0.6, 0.8, and 1.0) were prepared by conventional solid state reaction method. Bulk and surface characterization of these ferrites were carried out by different techniques. The ratios Zn/Fe and Mg/Fe determined by PIXE and AAS were nearly as expected from the synthesis mixture, i.e. following the substitution model. XRD shows only a spinel structure (fcc) with increasing lattice parameter as x increases from 0 to 1. The bulk ratios of tetrahedral to octahedral sites occupied by Fe cations measured by NGR are in good agreement with the theoretical bulk stoichiometry. LEIS results indicate a Mg substitution by Fe cations at the surface. Only octahedral sites are proposed at the surface. The transition from inverse to normal spinel was follow through NGR-spectra occurring at x=0.4.

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Authors and Affiliations

  1. Instituto Mexicano del Petróleo, A. P. 14-805, 07730, México, D. F., Mexico

    N. Nava & A. García

  2. Eindhoven University of Technology, Faculty of Physics and Schuit Institute of Catalysis, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands

    J. P. Jacobs, J. J. W. M. Rosink, L. J. Van Ijzendoorn & H. H. Brongersma

  3. Instituto Politecnico Nacional, ESIOIE, UPALM Ed. 8, C.P. 7300, México, D. F., México

    M. A. Valenzuela

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  1. N. Nava
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  2. J. P. Jacobs
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  3. A. García
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  4. J. J. W. M. Rosink
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  5. M. A. Valenzuela
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  6. L. J. Van Ijzendoorn
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  7. H. H. Brongersma
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Nava, N., Jacobs, J.P., García, A. et al. Surface and bulk cation distribution of the spinel system ZnxMg1−xFe2O4 . Journal of Radioanalytical and Nuclear Chemistry Letters 212, 431–443 (1996). https://doi.org/10.1007/BF02163288

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  • DOI: https://doi.org/10.1007/BF02163288

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