Particular topological complexity of lead oxide blocks in Pb31O22X18 (X = Br, Cl) |
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| Authors: | Krivovichev Sergey V Siidra Oleg I Nazarchuk Evgenii V Burns Peter C Depmeier Wulf |
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| Institution: | Department of Crystallography, St. Petersburg State University, University Emb. 7/9, 199034 St. Petersburg, Russia. skrivovi@mail.ru |
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| Abstract: | Dark-green platy crystals of the new compound Pb31O22Br10Cl8 (1) have been obtained by rapid quenching of a lead oxide halide melt. The structure of 1 (triclinic, P1, a = 12.1192(7) angstroms, b = 16.2489(10) angstroms, c = 18.3007(11) angstroms, alpha = 93.104(2) degrees, beta = 95.809(2) degrees, gamma = 111.252(1) degrees, V = 3325.4(3) angstroms3, Z = 2) can be viewed as incorporation of PbX6]4- halide units (X = Br, Cl) into the defect PbO matrix. The latter represents a two-dimensional O22Pb30]16+ cationic layer of OPb4 tetrahedra that can be derived from the OPb] tetrahedral layer observed in tetragonal PbO. The layer consists of 22 symmetrically inequivalent OPb4 tetrahedra and represents the topologically most complicated arrangement of tetrahedra known to date. |
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