Schichtanionen in den Kristallstrukturen der isotypen Verbindungen Sr2[Ga2S5], Ba2[In2S5] und Ba2[In2Se5]

Layer-Anions in the Crystal Structures of the Isotypic Compounds Sr₂Ga₂S₅], Ba₂In₂S₃], and Ba₂In₂Se₅] The compounds Sr₂Ga₂S₅], Ba₂In₂S₅], and Ba₂In₂Se₅] have been prepared from stoichiometric mixtures of the elements at temperatures between 1150°C and 1250°C. They are isotypic (space group Pbca, Z = 8) with the lattice constants see ?Inhaltsübersicht”?. In the anionic part of the structure GaS₄-(InS₄-/InSe₄)-tetrahedra share three common vertices to form layers with rings built by four and eight tetrahedra. The cations are placed between the sheets and have the coordination number seven.