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  • Title: BaLn2Se4 (Ln = Er, Tm and Yb).
    Author: Bugaris DE, Ibers JA.
    Journal: Acta Crystallogr C; 2009 Sep; 65(Pt 9):i60-2. PubMed ID: 19726843.
    Abstract:
    The compounds BaLn(2)Se(4) (Ln = rare-earth metal = lanthanide = Er, Tm and Yb), namely barium di(erbium/thulium/ytterbium) tetraselenide, crystallize in the orthorhombic space group Pnma in the CaFe(2)O(4) structure type. In this structure type, all atoms possess m symmetry. The Ln atoms are octahedrally coordinated by six Se atoms. A three-dimensional channel structure is formed by the corner- and edge-sharing of these LnSe(6) octahedra. The Ba atoms are coordinated to eight Se atoms in a bicapped trigonal-prismatic arrangement, and they occupy the channels of the three-dimensional framework.
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