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Influence of Mn-for-Fe substitution on structural properties of synthetic goethite

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Abstract

In order to study the effect of alloying elements, such as manganese, on the properties of the rust on weathering steels, a series of Mn-goethite samples containing different amounts of Mn were synthesized from ferrihydrite in alkaline media. The samples were characterized by X-ray diffraction (XRD) and Mössbauer spectroscopy. The cell parameters calculated from the XRD patterns showed clearly that the a- and c-parameters decrease while the b-parameter increases with increasing Mn concentration, indicating that the octahedra of the goethite structure become distorted by an incorporation of Mn (Jahn–Teller-effect). Mössbauer spectra of the samples were recorded at room temperature (RT) and at 80 K. The quadrupole shift values gradually decrease with increasing Mn substitution in the goethite structure. It has been observed that the magnetic hyperfine field values of maximum probability are reduced with increasing Mn in the samples. No doublet component was observed in the RT MS spectra suggesting that no effects of superparamagnetim resulting from smaller particles are present.

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Authors and Affiliations

  1. Department of Subatomic and Radiation Physics, University of Ghent, 9000, Ghent, Belgium

    J. A. Mejía Gómez, V. G. de Resende & E. De Grave

  2. Arcelor Research Industry Gent (ARIG), 9060, Zelzate, Belgium

    J. A. Mejía Gómez & J. Antonissen

Authors
  1. J. A. Mejía Gómez
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  2. V. G. de Resende
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  3. J. Antonissen
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  4. E. De Grave
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Correspondence to J. A. Mejía Gómez.

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Mejía Gómez, J.A., de Resende, V.G., Antonissen, J. et al. Influence of Mn-for-Fe substitution on structural properties of synthetic goethite. Hyperfine Interact 189, 143–149 (2009). https://doi.org/10.1007/s10751-009-9909-8

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  • DOI: https://doi.org/10.1007/s10751-009-9909-8

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