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Figure 7
Polyhedral representation of …β(ααβ)α… ganomalite-(Bi/Na/Pb Ge □)-3T [Bi3Na3][Pb9][(Ge2O7)3(GeO4)3]□3 including the twist angles (φ) for the αα and αβ boundaries. The metaprisms at the α–α boundary are primarily occupied by smaller Na+ and have an acute φ, while at the α-β boundary Bi+ is dominant and φ is larger. Pb2+ partitions almost exclusively to the tunnel sites where lone-pair electrons occupy the channel. The substantial distortion of the BiO6 metaprisms may imply that stereochemically active lone-pair electrons are operative.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 66| Part 1| February 2010| Pages 1-16
https://doi.org/10.1107/S0108768109053981
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