Darstellung und Kristallstruktur des K2Sb4S7 / Preparation and Crystal Structure of K2Sb4S7

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Abstract
In the K2S/Sb2S3-System the compound K2Sb4S7 has been prepared and its structure determined. In this structure there are two differently coordinated Sb-atoms: the SbI-atoms in the vertices of flat SbS3-pyramides have the CN 3 to sulfur, the SbII-atoms are ψ-trigonal-bipyramidal coordinated with one free position in the equatorial plane. These polyhedra are connected to each other by common corners and edges to a three-dimensional net, which has channels parallel the b-axis, in which the K+-ions are located.