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The Mössbauer spectrum of synthetic hureaulite: Fe5 2+(H2O)4(PO4H)2(PO4)2

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Abstract

The crystal structure of synthetic ferrous hureaulite, Fe5 2+ (H2O)4(PO4H)2(PO4)2, was refined from single-crystal X-ray data. It is monoclinic, space group C2/c, with a=17.487(4), b=9.017(2), c=9.338(2) Å, β=96.27(3)°, V=1463.6(6) Å3, Z=4 and D calc=3.327 g/cm3. This end member of the hureaulite series was crystallized under distinctly acidic conditions, by a method that gives perfect crystals, large enough for X-ray single crystal studies. The main feature of the hureaulite structure is that it has an equal number of normal (PO4)3+ and acid (PO4H)2+ tetradentate groups. These are centered on Fe2+ atoms and share corners with edge-linked octahedra, forming pentamer units. The five Fe2+ atoms are distributed on three distinct sites in these units. This can be directly observed in the Mössbauer spectrum at 295 K, which contains three doublets whose relative intensities correspond to the 1:2:2 distributions of crystallographic sites.

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Authors and Affiliations

  1. Facultad de Ciencias Físicas, Universidad Nacional Mayor de San Marcos, Apto. Postal 14-0149, Lima-14, Peru

    Angel Bustamante

  2. Instituto de Física, Universidade Federal do Rio de Janeiro, P.O. Box: 68.528, 21945-970, Rio de Janeiro, RJ, Brazil

    Enrico Mattievich, Helio S. de Amorim & Máximo M. Silveira

  3. Instituto de Física, Universidade Federal de Goiás, P.O. Box 131, 74001-970, Goiânia, GO, Brazil

    Ivo Vencato

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  1. Angel Bustamante
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  2. Enrico Mattievich
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  3. Helio S. de Amorim
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  4. Ivo Vencato
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  5. Máximo M. Silveira
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Correspondence to Angel Bustamante.

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Bustamante, A., Mattievich, E., de Amorim, H.S. et al. The Mössbauer spectrum of synthetic hureaulite: Fe5 2+(H2O)4(PO4H)2(PO4)2 . Hyperfine Interact 166, 599–603 (2005). https://doi.org/10.1007/s10751-006-9326-1

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  • DOI: https://doi.org/10.1007/s10751-006-9326-1

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