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Mössbauer study of bornite and chemical bonding in Fe-bearing sulphides

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Abstract

The Mössbauer spectra of a nearly stoichiometric natural bornite, Cu5FeS4, specimen were reinvestigated between 295 and 4.2 K. There is no difference between the Neél temperature T N as determined by the Mössbauer effect or by the susceptibility measurements (T N = 67.5 K). No additional paramagnetic doublet can be observed in the low-temperature MS spectra. The valence state of Fe is Fe(3−x)+ caused by a partial electron transfer from the Cu+ ions to the Fe3+ ions which increases the shielding of the s-electrons by the d-electron density and by this increases the isomer shift to a value intermediate between tetrahedral high-spin Fe2+ and tetrahedral high-spin Fe3+.

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Acknowledgements

Authors acknowledge the Departments of Chemistry and of Earth Sciences of the University of Florence, for funding this research under the ex-60% programme, and the Italian CNR, for support.

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Authors and Affiliations

  1. Dipartimento di Scienze della Terra, Università di Firenze, Florence, Italy

    M. Borgheresi, F. Di Benedetto & M. Romanelli

  2. IGG-CNR, Florence, Italy

    F. Di Benedetto & G. Montegrossi

  3. INSTM Unit of Florence, Florence, Italy

    F. Di Benedetto, M. Romanelli, A. Giaccherini, L. Sorace & G. Montegrossi

  4. Institut für Festkörperphysik, TU Wien, Vienna, Austria

    M. Reissner

  5. Fachbereich Chemie und Physik der Materialien, Universität Salzburg, Salzburg, Austria

    W. Lottermoser, G. Tippelt, R. Wagner & G. Amthauer

  6. Kazan Federal University, Kazan, Russia

    R. R. Gainov & R. R. Khassanov

  7. Forschungszentrum Jülich, Jülich, Germany

    R. R. Gainov

  8. Dipartimento di Chimica U. Schiff, Università di Firenze, Sesto Fiorentino, Italy

    A. Giaccherini & L. Sorace

Authors
  1. M. Borgheresi
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  2. F. Di Benedetto
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  3. M. Romanelli
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  4. M. Reissner
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  5. W. Lottermoser
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  6. R. R. Gainov
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  7. R. R. Khassanov
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  8. G. Tippelt
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  9. A. Giaccherini
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  10. L. Sorace
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  11. G. Montegrossi
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  12. R. Wagner
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  13. G. Amthauer
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Correspondence to F. Di Benedetto.

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Borgheresi, M., Di Benedetto, F., Romanelli, M. et al. Mössbauer study of bornite and chemical bonding in Fe-bearing sulphides. Phys Chem Minerals 45, 227–235 (2018). https://doi.org/10.1007/s00269-017-0911-4

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  • DOI: https://doi.org/10.1007/s00269-017-0911-4

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