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57Fe mössbauer study of synthetic Fe3+-melilites

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Abstract

Synthetic Fe3+-melilites containing NaCaFe3+-Si2O7-, Ca2Fe3+AlSiO7- or Sr2Fe3+AlSiO7-components have been studied by 57Fe Mössbauer spectroscopy. The spectrum of åkermanite containing an NaCaFe3+Si2O7-component consists of one doublet identified to belong to Fe3+ in T1 sites. The spectra of åkermanite and gehlenite containing Ca2Fe3+ AlSiO7- or Sr2Fe3+ AlSiO7-component consist of two doublets. The inner and outer doublets are identified to belong to Fe3+ in the less distorted T1 and that in the more distorted T2 sites, respectively. The area ratios of the spectra show that the site occupancy of Fe3+ (T1) in gehlenite is less than that in åkermanite in which the distribution of Fe3+ in T1 and T2 sites is apparently random. The different distributions can be explained in terms of competition between minimizing the deficiency in the electrostatic valence and the preference of Al for T1 sites which the isomer shift measurements show to be more ionic.

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Authors and Affiliations

  1. Department of Geology and Mineralogy, Hokkaido University, 060, Sapporo, Japan

    Masahide Akasaka

  2. National Institute for Research in Inorganic Materials, Namiki 1-1, Sakura-mura, Niihari-gun, 305, Ibaragi, Japan

    Haruo Ohashi

Authors
  1. Masahide Akasaka
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  2. Haruo Ohashi
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Akasaka, M., Ohashi, H. 57Fe mössbauer study of synthetic Fe3+-melilites. Phys Chem Minerals 12, 13–18 (1985). https://doi.org/10.1007/BF00348740

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  • DOI: https://doi.org/10.1007/BF00348740

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