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Quadrupole Splitting Distribution of Fe2+ in Synthetic Trioctahedral Micas

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Abstract

About 80 different synthetic trioctahedral micas {K}[Fe2+ 3−x Me x ]〈Si,Al,Fe〉4O10(OH)2 with Me = Ni2+, Mg2+, Co2+, Al3+ and Fe3+ have been synthesized by hydrothermal methods and subsequently investigated by 57Fe Mössbauer spectroscopy. Mössbauer spectra were refined in terms of a quadrupole splitting distribution (QSD) with at least 2 components for Fe2+ and additional components for Fe3+ on octahedral and tetrahedral positions. Three Fe2+ components have to be used in all samples containing distinct amounts of trivalent cations (Fe3+, Al3+). A rough positive correlation between the intensity of this third Fe2+ QSD component and the content of trivalent octahedral cations has been found. Substitution of Fe2+ by smaller divalent cations causes a distinct increase of ferrous quadrupole splitting. This suggests the remaining Fe2+O4(OH)2 octahedra to become more regular. This holds true for micas with 〈AlSi3〉 and with 〈FeSi3〉 composition of the tetrahedral sheet. In micas with Fe3+ in tetrahedral coordination there is a distinct increase of the quadrupole splitting of tetrahedral Fe3+ with decreasing size of the octahedral sheet. This can be explained by an increasing distortion of the second oxygen coordination sphere around tetrahedral Fe3+ due to increasing ditrigonal distortion of the tetrahedral sheet.

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Authors and Affiliations

  1. Institute of Crystallography, RWTH Aachen, Jägerstr. 17/19, D-52056, Aachen, Germany

    G. J. Redhammer & G. Roth

  2. Institute of Mineralogy, University Salzburg, Hellbrunnerstr. 34, A-5020, Salzburg, Germany

    G. Amthauer & W. Lottermoser

Authors
  1. G. J. Redhammer
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  2. G. Amthauer
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  3. W. Lottermoser
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  4. G. Roth
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Redhammer, G.J., Amthauer, G., Lottermoser, W. et al. Quadrupole Splitting Distribution of Fe2+ in Synthetic Trioctahedral Micas. Hyperfine Interactions 141, 345–349 (2002). https://doi.org/10.1023/A:1021224019074

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