Penta­lanthanum zinc diplumbide, La(5)Zn(1−x)Pb(2+x) (x ≃ 0.6)

The title non-stoichiometric penta­lanthanum zinc diplumbide, La(5)Zn(1−x)Pb(2+x) (x ≃ 0.6), was prepared from the elements in an evacuated silica ampoule. It adopts the Nb(5)Sn(2)Si-type structure (space group I4/mcm, Pearson symbol tI32), a ternary ordered superstructure of the W(5)Si(3) type. Amo...

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Detalles Bibliográficos
Autores principales: Oshchapovsky, Igor, Pavlyuk, Volodymyr, Dmytriv, Grygoriy, Harbrecht, Bernd
Formato: Online Artículo Texto
Lenguaje:English
Publicado: International Union of Crystallography 2013
Materias:
Inorganic Papers
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3914033/
https://www.ncbi.nlm.nih.gov/pubmed/24526938
http://dx.doi.org/10.1107/S1600536813033618
Descripción
Sumario:The title non-stoichiometric penta­lanthanum zinc diplumbide, La(5)Zn(1−x)Pb(2+x) (x ≃ 0.6), was prepared from the elements in an evacuated silica ampoule. It adopts the Nb(5)Sn(2)Si-type structure (space group I4/mcm, Pearson symbol tI32), a ternary ordered superstructure of the W(5)Si(3) type. Among the four independent crystallographic positions, three are fully occupied by La (Wyckoff 16k), La (4b), and Pb (8h) and one is occupied by a statistical mixture [occupancy ratio 0.394 (12):0.606 (12)] of Zn and Pb (4a). The structure is constructed by face-sharing 10-vertex polyhedra around the unmixed Pb sites. These fragments enclose channels of trans-face-sharing tetra­gonal anti­prisms occupied by the disordered Zn and Pb sites.

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