Abstract
An empirical expression for the dependence of the magnetic hyperfine field on the aluminium content and the particle size in iron oxides and oxyhydroxides is often used in Mössbauer studies of soil samples. According to this expression, the reduction of the hyperfine field in nanometer-sized particles should be proportional to the inverse particle diameter. This is apparently in disagreement with the expression for the influence of collective magnetic excitations on the magnetic hyperfine field, which predicts a reduction proportional to the inverse volume. It is shown that this apparent discrepancy in the case of non-interacting hematite nanoparticles (accidentally) can be explained by the size dependence of the magnetic anisotropy constant. However, it is also pointed out that a third parameter, namely the strength of the inter-particle interactions, can have a significant influence on the magnetic hyperfine splitting in Mössbauer spectra of magnetic nanoparticles. Therefore, an analysis of data, based on the empirical expression, which only takes into account the particle size and the aluminium content, can give erroneous results.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Coey, J. M. D., Hyp. Interact. 66 (1991), 51.
Murad, E., Phys. Chem. Miner. 23 (1996), 248.
Murad, E., Hyp. Interact. 111 (1998), 251.
Murad, E. and Johnston, J. H., In: G. J. Long (ed.), Mössbauer Spectroscopy Applied to Inorganic Chemistry, Vol. 2, Plenum Press, New York and London, 1987, p. 507.
de Grave, E., da Costa, G. M., Bowen, L. H., Barrero, C. A. and Vandenberghe, R. E., Hyp. Interact. 117 (1998), 245.
Vandenberghe, R. E., Barrero, C. A., da Costa, G. M., van San, E. and de Grave, E., Hyp. Interact. 126 (2000), 247.
Golden, D. C., Bowen, L. H., Weed, S. B. and Bigham, J. M., Soil Sci. Soc. Am. J. 43 (1979), 802.
Goodman, B. A. and Lewis, D. G., J. Soil Sci. 32 (1981), 351.
Murad, E. and Schwertmann, U., Clay Minerals 18 (1983), 301.
Murad, E. and Schwertmann, U., Clays and Clay Minerals 34 (1986), 1.
De Grave, E., Bowen, L. H., Amarasiriwardena, D. D. and Vandenberghe, R. E., J. Magn. Magn. Mater. 72 (1988), 129.
Barrero, C. A., Vandenberghe, R. E., de Grave, E. and Costa, G. M., Conf. Proc., Vol. 50, “ICAME-95”, I. Ortalli (ed.), SIF, Bologna, p. 717.
Néel, L., Ann. Geophys. 5 (1949), 99.
Brown, Jr., W. F., Phys. Rev. 130 (1963), 1677.
Mørup, S. and Topsøe, H., Appl. Phys. 11 (1976), 63.
Mørup, S., J. Magn. Magn. Mater. 37 (1983), 39.
Hansen, M. F., Bender Koch, C. and Mørup, S., Phys. Rev. B 62 (2000), 1124.
Bødker, F. and Mørup, S., Europhys. Lett. 52 (2000), 217.
Sugimoto, T., Wang, Y., Itoh, H. and Muramatsu, A., Colloid. Surf. A 134 (1990), 265.
Bødker, F., Mørup, S. and Linderoth, S., Phys. Rev. Lett. 72 (1994), 282.
Tronc, E., Il Nuovo Cimento 18D (1996), 163.
Mørup, S., Madsen, M.B., Franck, J., Villadsen, J. and Koch, C. J. W., J. Magn. Magn. Mater. 40 (1983), 163.
Koch, C. J. W., Madsen, M. B., Mørup, S., Christiansen, G. and Gerward, L., Clays and Clay Minerals 34 (1986), 17.
Koch, C. J. W., Borggaard, O. K., Madsen, M. B. and Mørup, S., In: L. G. Schultz, H. van Olphen and F. A. Mumpton (eds), Proceedings of the International Clay Conference, Denver 1985, The Clay Minerals Society, Bloomington, Indiana, 1987, p. 212.
Bødker, F., Hansen, M. F., Bender Koch, C. and Mørup, S. J. Magn. Magn. Mater. 221 (2000), 32.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Mørup, S., Ostenfeld, C.W. On the Use of Mössbauer Spectroscopy for Characterisation of Iron Oxides and Oxyhydroxides in Soils. Hyperfine Interactions 136, 125–131 (2001). https://doi.org/10.1023/A:1015516828586
Issue Date:
DOI: https://doi.org/10.1023/A:1015516828586