Abstract
Flux-grown single crystals of the new compound PbSn(PO4)2have been studied by X-ray diffraction. It crystallizes in monoclinic space groupP21/n(No. 14), with cell parametersa=4.861(6) Å,b=14.75(2) Å,c=8.80(2) Å,β=93.0(1)°,Z=4. Its structure is related to the yavapaiite type with a skeleton made up of corner-linked SnO6octahedra and PO4tetrahedra, but the lead atoms are located in double tunnels instead of sheets. An active PbIIlone pair has been localized from electrostatic interactions in order to explain this original structure.
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