Synthesis and crystal structure of La(21)Cr(8−2a)Al(b)Ge(7−b)C(12) [a = 0.22 (2) and b = 0.758 (19)]

Single crystals of a new multinary chromium carbide, La(21)Cr(8−2a)Al(b)Ge(7−b)C(12) (henicosa­lanthanum octa­chromium aluminium hexa­germanium dodeca­carbide), were grown from an La-rich self flux and were characterized by single-crystal X-ray diffraction. The face-centered cubic crystal structure...

Descripción completa

Detalles Bibliográficos
Autores principales: Pabla, Jaskarun, Janssen, Yuri, Simonson, Jack W.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: International Union of Crystallography 2016
Materias:
Research Communications
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5095834/
https://www.ncbi.nlm.nih.gov/pubmed/27840709
http://dx.doi.org/10.1107/S2056989016015668
Descripción
Sumario:Single crystals of a new multinary chromium carbide, La(21)Cr(8−2a)Al(b)Ge(7−b)C(12) (henicosa­lanthanum octa­chromium aluminium hexa­germanium dodeca­carbide), were grown from an La-rich self flux and were characterized by single-crystal X-ray diffraction. The face-centered cubic crystal structure is composed of isolated and geometrically frustrated regular Cr tetra­hedra that are co-centered within regular C octa­hedra. These mutually separated Cr(4−a)C(6) clusters are distributed throughout a three-dimensional framework of Al, Ge, and La. The title compound is isotypic with La(21−δ)Mn(8) X (7)C(12) and R (21)Fe(8) X (7)C(12) (R = La, Ce, Pr; X = Al, Bi, Ge, Sn, Sb, Te) and represents the first example of a Cr-based compound with this structure-type.

Ejemplares similares