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Single crystals of a new multinary chromium carbide, La 21 Cr 8-2 a  Al  b  Ge 7- b  C 12 (henicosa-lanthanum octa-chromium aluminium hexa-germanium dodeca-carbide), 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 tetra-hedra that are co-centered within regular C octa-hedra. 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.

acta crystallographica. section e, crystallographic communications

Synthesis and crystal structure of La21Cr8−2aAlbGe7−bC12[a= 0.22 (2) andb= 0.758 (19)]