Crystal structure of Pb(6)O (Si(6)Al(2))O(20)

Siidra, O. I., Krivovichev, S. V. and Depmeier, W. (2009) Crystal structure of Pb(6)O (Si(6)Al(2))O(20) Glass Physics and Chemistry, 35 (4). pp. 406-410. DOI 10.1134/s1087659609040099.

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The crystal structure of Pb(6)O[(Si(6)Al(2))O(20))] is investigated using X-ray diffraction. The compound has tetragonal symmetry, space group I4/mmm, a = 11.7162(10) , c = 8.0435(12) , and V = 1104.13(2) (3). The structure is refined to R (1) = 0.036 for 562 unique reflections with [F (0)] a parts per thousand yen 4 sigma F. The structure contains two symmetrically independent positions of the Pb(2+) cations coordinated by five O atoms (Pb(2+)-O(2-) = 2.34-2.68 ). The TO(4) tetrahedra (T = Si, Al) form tubular [(Si(6)Al(2))O(20)] chains extended along the c axis. The O(4) 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 OPb(6) 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 Pb(2+) cations due to the formation of oxo-centered complexes.

Document Type: Article
Keywords: bond-valence parameters pbo-al2o3-sio2 system silicate-glasses pbo-sio2 glasses lead-oxide chemistry conductivity fluorine phase
Research affiliation: Kiel University
DOI etc.: 10.1134/s1087659609040099
ISSN: 1087-6596
Date Deposited: 22 Dec 2011 05:33
Last Modified: 08 Oct 2012 10:10

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