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The title compound, hexabarium lead(II) dodecafluoride dichloride, is a solid solution in the system Pb7F12Cl2–Ba7F12Cl2 and crystallizes isotypically with the ordered modification of the parent compounds in the space group P-6. The coordination polyhedra of the three different metal sites are distorted tricapped trigonal prisms with F7Cl2 coordination sets for two of these sites (Wyckoff positions 3k and 3j, each with site symmetry m..), and the remaining site being exclusively coordinated by fluoride ions (1a, -6..). By sharing faces, a three-dimensional structure is accomplished. The three metal sites have remarkably different occupancies by the two types of metal ions. Whereas the site on the 3k position shows only a minor incorporation of Pb2+ [occupancy ratio Ba:Pb = 0.93 (4):0.07 (4)], the 3j site shows the highest amount of incorporated Pb2+ [Ba:Pb = 0.71 (5):29 (5)]. The occupancy ratio with respect to the 1a site is Ba:Pb = 0.86 (5):0.14 (5)

The solid solution Ba5.78Pb1.22F12Cl2

The solid solution Ba_5.78Pb_1.22F₁₂Cl₂