Glass Physics and Chemistry

, Volume 35, Issue 4, pp 406–410 | Cite as

Crystal structure of Pb6O[(Si6Al2)O20]

  • O. I. Siidra
  • S. V. Krivovichev
  • W. Depmeier


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.


Silicate Glass Lone Electron Pair Glass Physic Aluminosilicate Glass Lead Silicate 
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© Pleiades Publishing, Ltd. 2009

Authors and Affiliations

  • O. I. Siidra
    • 1
  • S. V. Krivovichev
    • 1
    • 2
  • W. Depmeier
    • 3
  1. 1.Faculty of GeologySt. Petersburg State UniversitySt. PetersburgRussia
  2. 2.Grebenshchikov Institute of Silicate ChemistryRussian Academy of SciencesSt. PetersburgRussia
  3. 3.Institute of GeologyUniversity of KielKielGermany

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