Serveur d'exploration sur le thulium

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BaLn2Se4 (Ln = Er, Tm and Yb)

Identifieur interne : 001044 ( Main/Exploration ); précédent : 001043; suivant : 001045

BaLn2Se4 (Ln = Er, Tm and Yb)

Auteurs : Daniel E. Bugaris [États-Unis] ; James A. Ibers [États-Unis]

Source :

RBID : ISTEX:1967F9CA6F704632547ECFE5589EA15B97508DB0

English descriptors

Abstract

The compounds BaLn2Se4 (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 CaFe2O4 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 LnSe6 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.

Url:
DOI: 10.1107/S0108270109030571


Affiliations:


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Le document en format XML

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<div type="abstract" xml:lang="en">The compounds BaLn2Se4 (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 CaFe2O4 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 LnSe6 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.</div>
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