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Crystal chemistry of basic lead carbonates. II. Crystal structure of synthetic ‘plumbonacrite’

Published online by Cambridge University Press:  05 July 2018

S. V. Krivovichev  and
P. C. Burns
S. V. Krivovichev*
Affiliation:
Department of Civil Engineering and Geological Sciences, 156 Fitzpatrick, University of Notre Dame, Notre Dame IN 46556-0767, USA
P. C. Burns
Affiliation:
Department of Civil Engineering and Geological Sciences, 156 Fitzpatrick, University of Notre Dame, Notre Dame IN 46556-0767, USA
*
*E-mail: sergey@cryst.geol.pu.ru
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Abstract

The crystal structure of synthetic ‘plumbonacrite’, Pb5O(OH)2(CO3)3, hexagonal, P63cm, a = 9.0921(7), c = 24.923(3)Å, V = 1784.3(3)Å3, Z = 6, has been solved by direct methods and refined to R = 0.049. There are six symmetrically independent Pb2+ positions in the structure, the coordination polyhedra of which are strongly distorted due to the effect of s2 lone-electron pairs on the Pb2+ cations. The Pb(6) position is disordered with a Pb–Pb distance of 1.24 Å . The structure of ‘plumbonacrite’ is built from complex Pb–O layers parallel to the (001) plane similar to those observed in polymorphs of Pb4(OH)2(SO4)(CO3)2. The structure of these layers can be described in terms of Pb–O,OH motifs and CO3 groups. The smallest structural subunit is the oxocentred [OPb4] tetrahedron that shares three of its Pb-Pb edges with three [(OH)Pb3] distorted triangles to form [O(OH)3Pb7] clusters. These clusters are surrounded by CO3 groups, forming more complex clusters. Due to the disorder in the Pb(6) site, the clusters comprising this site are linked with each other via OH(10) groups to give continuous sheets of Pb–O,OH bonds which are parallel to the (001) plane. The [O(OH)3Pb7] clusters in ‘plumbonacrite’ may be important in more complex Pb carbonate oxo/hydroxo complexes that may exist in aqueous environments.

Keywords

‘plumbonacrite’lead carbonatelead oxo/hydroxo clusters
Type
Research Article
Information
Mineralogical Magazine , Volume 64 , Issue 6 , December 2000 , pp. 1069 - 1075
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2000

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Footnotes

†

Permanent address: Department of Crystallography, St. Petersburg State University, University Emb. 7/9. 199034 St. Petersburg, Russia

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