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Synthesis and characterization of the lead borate Pb~6~B~12~O~21~(OH)~6~ by Sandra Schönegger; Teresa S. Ortner; Klaus Wurst; Gunter Heymann; Hubert Huppertz is a Chemistry article available to read on EtoBox.

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## Abstract A lead borate with the composition Pb~6~B~12~O~21~(OH)~6~ was synthesized through a hydrothermal synthesis, using lead metaborate in combination with sodium nitrate and potassium nitrate. The compound crystallizes in the trigonal, non-centrosymmetric space group __P__3~2~ (no. 145) with the lattice parameters __a__ = 1176.0(4), __c__ = 1333.0(4) pm, and __V__ = 0.1596(2) nm^3^. Interestingly, the data of Pb~6~B~12~O~21~(OH)~6~ correct the structure of a literature known lead borate with the composition “Pb~6~B~11~O~18~(OH)~9~”. For the latter compound, nearly identical lattice parameters of __a__ = 1176.91(7) and __c__ = 1333.62(12) pm were reported, possessing a crystal structure, in which the localization and refinement of one boron atom was obviously overlooked. The structure of Pb~6~B~12~O~21~(OH)~6~ is built up from trigonal planar BO~3~ and tetrahedral BO~4~ groups forming complex chains. The Pb^2+^ cations are located between neighboring polyborate chains. The here reported compound Pb~6~B~12~O~21~(OH)~6~ and “Pb~6~B~11~O~18~(OH)~9~” were, however, produced under different synthesis conditions. While “Pb~6~B~11~O~18~(OH)~9~” was synthesized __via__ a hydrothermal

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Author

Sandra Schönegger; Teresa S. Ortner; Klaus Wurst; Gunter Heymann; Hubert Huppertz

Publisher

Walter de Gruyter GmbH

Published

2016

Language

EN

Field

Chemistry (Physical Sciences)