J. Bouvaist, D. Weigel
Sep 1, 1970
Citations
1
Influential Citations
24
Citations
Journal
Acta Crystallographica Section A
Abstract
The structure proposed for lead sesquioxide by Bystrom (1947) is incorrect. The space group found in the present work is P21/a with four Pb2O3 in the unit cell; the unit-cell dimensions are: a = 7.814, b = 5.625, c = 8.466 A (all ± 0.003 A); β = 124°48′ ± 5′. The structure has been determined by means of X-ray and neutron-diffraction powder data, and refined by a full-matrix least-squares method. The Pb4+ ions are surrounded by six oxygen atoms forming deformed octahedra, with an average Pb–O distance of 2.18 A. These octahedra share edges and corners to form a two-dimensional framework parallel to (001). These layers are interconnected by pb2+ ions having sixfold coordination, with Pb–O separations ranging from 2.30 to 3.00 A. The three shortest distances Pb2+–O2− give rise to a Pb2+ coordination reminiscent of the threefold coordination of Pb2+ in Pb3O4.