Acta Cryst. (2008). E64, i16  [ doi:10.1107/S1600536808003267 ]

-Lead tellurite from single-crystal data

V. E. Zavodnik, S. A. Ivanov and A. I. Stash

Abstract: The crystal structure of the title compound, -PbTeO₃ (PTO), has been reported previously by Mariolacos [Anz. Oesterr. Akad. Wiss. Math. Naturwiss. Kl. (1969), 106, 128-130], refined on powder data. The current determination at room temperature from data obtained from single crystals grown by the Czochralski method shows a significant improvement in the precision of the geometric parameters when all atoms have been refined anisotropically. The selection of a centrosymmetric (C2/c) structure model was confirmed by the second harmonic generation test. The asymmetric unit contains three formula units. The structure of PTO is built up of three types of distorted [PbO_x] polyhedra (x = 7 and 9) which share their O atoms with TeO₃ pyramidal units. These main anionic polyhedra are responsible for establishing the two types of tunnel required for the stereochemical activity of the lone pairs of the Pb²⁺ and Te⁴⁺ cations.

Online 6 February 2008

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