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Figure 5
The coordination of the Pb2 site in vanadinite. The distances within the Pb2—O6Cl2 polyhedra are given. The Pb2—O1 distance is shortest in mimetite and the Cl—Cl (= c/2) distance is the longest, whereas the opposite is observed for vanadinite. Between the two Cl and O1 atoms is a large open space where the 6s2 electron lone pair on the Pb2+ cation occurs. As Pb2—O1 becomes shorter, the 6s2 lone-pair electrons move towards the two Cl atoms and cause them to move apart because of repulsion. The opposite is the case for vanadinite. This feature explains the different c unit-cell parameters for mimetite and vanadinite.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 25| Part 1| January 2018| Pages 214-221
https://doi.org/10.1107/S1600577517014217
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