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A Mössbauer and X-ray diffraction study of annites synthesized at different oxygen fugacities and crystal chemical implications

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Abstract

A refined set of Mössbauer parameters (isomer shifts, quadrupole splittings, Fe2+/Fe3+ ratios) and lattice parameters were obtained from annites synthesized hydrothermally at pressures between 3 and 5 kbars, temperatures ranging from 250 to 780° C and oxygen fugacities controlled by solid state buffers (NNO, QMF, IM, IQF). Mössbauer spectra showed Fe2+ and Fe3+ on both the M1 and the M2 site. A linear relationship between Fe3+ content and oxygen fugacity was observed. Towards low Fe3+ values this linear relationship ends at ≈10% of total iron showing that the Fe3+ content cannot be reduced further even if more reducing conditions are used. This indicates that in annite at least 10% Fe2+ are substituted by Fe3+ in order to match the larger octahedral layer to the smaller tetrahedral layer. IR spectra indicate that formation of octahedral vacancies plays an important role for charge balance through the substitution 3 Fe2+ → 2 Fe3+ + ▪(oct).

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Authors and Affiliations

  1. Institute of Mineralogy, University of Salzburg, Hellbrunnerstraße 34, A-5020, Salzburg

    G. J. Redhammer, E. Dachs & G. Amthauer

  2. Institute of Mineralogy and Crystallography, University of Vienna, Dr. Karl Lueger-Ring 1, A-1010, Vienna

    A. Beran

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  1. G. J. Redhammer
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  2. A. Beran
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  3. E. Dachs
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  4. G. Amthauer
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Redhammer, G.J., Beran, A., Dachs, E. et al. A Mössbauer and X-ray diffraction study of annites synthesized at different oxygen fugacities and crystal chemical implications. Phys Chem Minerals 20, 382–394 (1993). https://doi.org/10.1007/BF00203107

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  • DOI: https://doi.org/10.1007/BF00203107

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