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Crystal chemistry of basic lead carbonates. I. Crystal structure of synthetic shannonite, Pb2O(CO3)

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: [email protected]
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Abstract

The crystal structure of synthetic shannonite, Pb2O(CO3), orthorhombic, P212121, a = 5.1465(7), b = 9.014(1), c = 9.315(1)Å, V = 432.12(10)Å3, Z = 4, has been solved by direct methods and refined to R = 0.054. There are two symmetrically distinct Pb2+ cations in irregular coordination polyhedra due to the effect of stereoactive s2 lone-electron pairs. The structure can be described as composed of chains of [OPb2] composition running parallel to [100] that are built by corner-sharing of OPb3 oxocentred triangles. The [OPb2] chains are surrounded by CO3 groups to form complex [OPb2](CO3) chains that are linked into a 3-dimensional framework by additional Pb–O bonds. The structure has channels that are parallel to [100] in which the lone-electron pairs of the Pb2+ cations are probably located.

Keywords

shannonitelead oxide carbonatelone-electron pairs
Type
Research Article
Information
Mineralogical Magazine , Volume 64 , Issue 6 , December 2000 , pp. 1063 - 1068
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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