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Crystallography Reports

, Volume 64, Issue 3, pp 398–402 | Cite as

New Lead Orthosilicate {Pb4(О(ОН)2)}[SiO4] with a Framework of Anion-Centered Pb Tetrahedra Related to Sodalite

  • T. A. Eremina
  • E. L. BelokonevaEmail author
  • O. V. Dimitrova
  • A. S. Volkov
STRUCTURE OF INORGANIC COMPOUNDS

Abstract

New lead silicate {Pb4(О(ОН)2)}[SiO4] was synthesized under hydrothermal conditions and structurally characterized, sp. gr. P213, а = 8.9756(13) Å. According to the commonly used classification, the new compound belongs to orthosilicates. In the crystal structure, isolated SiO4 tetrahedra are located between numerous Pb atoms. The structure can be considered as an anion-centered positively charged zeolite-like framework composed of {O3Pb7}8+ clusters, which are linked to each other and include three edge-sharing (OPb4)6+ tetrahedra with one common vertex. The formula of this positively charged antiframework is {O(ОН)2Pb4}4+, and its cavities are occupied by negatively charged [SiO4]4– tetrahedra. This framework is similar to that of sodalite when relating the sites to the centers of gravity of the {O3Pb7}8+ clusters.

Notes

ACKNOWLEDGMENTS

We are grateful to S.M. Aksenov and Yu.V. Nelyubina for help in obtaining experimental data. We thank S.Yu. Stefanovich for measuring the SHG signal and researchers of the Laboratory of Local Methods of Substance Investigation at the Department of Petrology of the Faculty of Geology of the Lomonosov Moscow State University for determining the composition of the crystals.

FUNDING

The study was supported by the Russian Foundation for Basic Research, project no. 17-03-000886a.

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Copyright information

© Pleiades Publishing, Inc. 2019

Authors and Affiliations

  • T. A. Eremina
    • 1
  • E. L. Belokoneva
    • 1
    Email author
  • O. V. Dimitrova
    • 1
  • A. S. Volkov
    • 1
  1. 1.Moscow State UniversityMoscowRussia

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