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Crystal structure of Pb6O[(Si6Al2)O20]

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Abstract

The crystal structure of Pb6O[(Si6Al2)O20)] is investigated using X-ray diffraction. The compound has tetragonal symmetry, space group I4/mmm, a = 11.7162(10) Å, c = 8.0435(12) Å, and V = 1104.13(2) Å3. The structure is refined to R 1 = 0.036 for 562 unique reflections with [F 0] ≥ 4σF. The structure contains two symmetrically independent positions of the Pb2+ cations coordinated by five O atoms (Pb2+-O2− = 2.34–2.68 Å). The TO4 tetrahedra (T = Si, Al) form tubular [(Si6Al2)O20] chains extended along the c axis. The O4 oxygen atom is not bonded to the Si and Al atoms and is octahedrally coordinated by six Pb atoms with the formation of an oxo-centered OPb6 octahedron. The assumption is made that, in some of lead silicate and aluminosilicate glasses, a number of oxygen atoms are located outside the tetrahedral structure and represent segregation centers of the Pb2+ cations due to the formation of oxo-centered complexes.

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Authors and Affiliations

  1. Faculty of Geology, St. Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg, 199034, Russia

    O. I. Siidra & S. V. Krivovichev

  2. Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, nab. Makarova 2, St. Petersburg, 199034, Russia

    S. V. Krivovichev

  3. Institute of Geology, University of Kiel, Kiel, D-24117, Germany

    W. Depmeier

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  1. O. I. Siidra
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  2. S. V. Krivovichev
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  3. W. Depmeier
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Correspondence to O. I. Siidra.

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Original Russian Text © O.I. Siidra, S.V. Krivovichev, W. Depmeier, 2009, published in Fizika i Khimiya Stekla.

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Siidra, O.I., Krivovichev, S.V. & Depmeier, W. Crystal structure of Pb6O[(Si6Al2)O20]. Glass Phys Chem 35, 406–410 (2009). https://doi.org/10.1134/S1087659609040099

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