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Mössbauer studies of magnetite and Al-substituted maghemites

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Abstract

This paper reviews a systematic Mössbauer study of maghemite γ-Fe2O3 and Al-substituted maghemites γ-(Fe1−y Al y )2O3. Three series of samples prepared from different methods and having different morphological characteristics and aluminum contents were investigated. It was found that both the cation distribution and the solubility limit depend on the preparation method, and no general conclusion in that respect could be inferred. From the temperature dependence of the hyperfine fields the exchange integrals could be calculated, and were found as: J AB= −25 K, JAA= −18 K, and JBB= −3 K. The hyperfine fields show a crossing in the vicinity of 300 K, for both substituted and unsubstituted samples, as a result of the relatively strong A–A interaction. The Curie temperatures were found to be in the range of 948–730 K, the lower value referring to the sample containing 22 mole% Al. The influence of maghemite on the Mössbauer spectra (MS) of magnetite was explored in some detail. It was demonstrated on the basis of the MS recorded for a variety of reference mixtures, that it is not possible to resolve the ferric A-site components due to maghemite and magnetite, even with the absorber subjected to a strong external field.

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Authors and Affiliations

  1. Departamento de Química, Universidade Fed. de Ouro Preto, 35400, Ouro Preto, MG, Brazil

    G.M. da Costa

  2. Department of Subatomic and Radiation Physics, NUMAT division, University of Gent, B-9000, Gent, Belgium

    E. De Grave & R.E. Vandenberghe

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  1. G.M. da Costa
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  2. E. De Grave
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  3. R.E. Vandenberghe
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da Costa, G., De Grave, E. & Vandenberghe, R. Mössbauer studies of magnetite and Al-substituted maghemites. Hyperfine Interactions 117, 207–243 (1998). https://doi.org/10.1023/A:1012691209853

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