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Acta Cryst. (2003). E59, i17-i19 [ doi:10.1107/S1600536803001259 ]
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-BaCaAlF7Abstract: -Barium calcium aluminium heptafluoride is a member of the isotypic complex fluorides of general formula BaCaMF7 (M = Al, Ga, Cr). The crystal structure is made up of triple layers which extend parallel to the (001) plane, and are stacked along [001], with a stacking unit of c/2. The central unit of one triple layer consists of edge-sharing ![[infinity]](/logos/entities/infin_rmgif.gif)
2[CaF8/2] polyhedra, forming a distorted fluorite-type arrangement. On both sides of this layer, isolated [AlF6] octahedra are attached by edge-sharing with the central unit. The triple layers are held together by 11-coordinate Ba atoms that are located between the layers.
Online 24 January 2003
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