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Mössbauer studies in an external field of well-crystallized Al-maghemites made from hematite

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Abstract

A series of hematites with up to 15 mol% Al substitution was converted to maghemites by reduction in the presence of organic matter, followed by slow oxidation. The maghemites formed were studied by Mössbauer spectroscopy in an external field of 60 kOe at 4 K. This technique allows the determination of site occupancy as well as the canting angle. The spectra are in agreement with a model having both vacancies and Al only in the octahedral sites and small canting angles for both sites. A small dipolar field at the tetrahedral sites was required to fit the line shape. The data indicate that about 10 mol% Al may be a solubility limit in maghemite.

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References

  1. E. Murad and J.H. Johnston, in:Mössbauer Spectroscopy Applied to Inorganic Chemistry, Vol. 2, ed. G.J. Long (Plenum Press, New York, 1987) pp. 507–582.

    Google Scholar 

  2. U. Schwertmann and H. Fechter, Soil Sci. Soc. Am. J. 48(1984)1462.

    Google Scholar 

  3. E. Wolska and U. Schwertmann, Solid State Ionics 32/33(1989)214.

    Google Scholar 

  4. B. Gillot and A. Rousset, Phys. Stat. Sol. (a) 118(1990)K5.

    Google Scholar 

  5. E. Murad, U. Schwertmann and J.D. Cashion, Hyp. Int. 54(1990)619.

    Google Scholar 

  6. U. Schwertmann and E. Murad, Clays Clay Miner. 38(1990)196.

    Google Scholar 

  7. S. Collyer, N.W. Grimes, D.J. Vaughan and G. Longworth, Am. Mineral. 73(1988)153.

    Google Scholar 

  8. M.F. de Jesus Filho, W. da Nova Mussel, Q. Qi and J.M.D. Coey,Proc. 6th Int. Conf. on Ferrites, Tokyo, 1992, in press.

  9. G.M. da Costa, E. De Grave, A.M. Bryan and L.H. Bowen, these Proceedings, Hyp. Int.

  10. A.M. Bryan, Ph.D. Thesis, Department of Chemistry, North Carolina State University, Raleigh, NC (1993).

    Google Scholar 

  11. G.M. da Costa, E. De Grave, L.H. Bowen, R.E. Vandenberghe and P.M.A. de Bakker, Clays Clay Miner. (1994), in press.

  12. P.M.A. de Bakker, E. De Grave, R.E. Vandenberghe, L.H. Bowen, R.J. Pollard and R.M. Persoons, Phys. Chem. Miner. 18(1991)131.

    Google Scholar 

  13. R.J. Polland, J. Phys.: Condens. Matter 2(1990)983.

    Google Scholar 

  14. E. De Grave, R.M. Persoons, R.E. Vandenberghe and P.M.A. de Bakker, Phys. Rev. B47(1993)5881.

    Google Scholar 

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Authors and Affiliations

  1. Department of Chemistry, North Carolina State University, Campus Box 8204, 27695, Raleigh, NC, USA

    L. H. Bowen & A. M. Bryan

  2. Laboratory of Magnetism, University of Gent, B-9000, Gent, Belgium

    E. De Grave (Research Director)

  3. National Fund for Scientific Research, Belgium

    E. De Grave (Research Director)

Authors
  1. L. H. Bowen
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  2. E. De Grave
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  3. A. M. Bryan
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Bowen, L.H., De Grave, E. & Bryan, A.M. Mössbauer studies in an external field of well-crystallized Al-maghemites made from hematite. Hyperfine Interact 94, 1977–1982 (1994). https://doi.org/10.1007/BF02063726

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