Glass Physics and Chemistry

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

Crystal structure of Pb6O[(Si6Al2)O20]

Article

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.

Keywords

Silicate Glass Lone Electron Pair Glass Physic Aluminosilicate Glass Lead Silicate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© 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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