Acta Cryst. (2013). E69, i17 [ doi:10.1107/S1600536813003541 ]
Abstract: Barium dierbium(III) tetrasulfide, BaEr2S4, crystallizes with four formula units in the orthorhombic space group Pnma in the CaFe2O4 structure type. The asymmetric unit contains two Er, one Ba, and four S atoms, each with .m. site symmetry. The structure consists of channels formed by corner- and edge-sharing ErS6 octahedra in which Ba atoms reside. The resultant coordination of Ba is that of a bicapped trigonal prism.
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